Fair enough. I think a centrist party (or coalition) is likely to emerge soon - the country can't shift between radical right and radical left indefinitely.
PRESIDENT
1789: John Hancock (No Party)
1799: Horatio Gates (New Tory/Conservative)
1809: Thomas Jefferson (D-R)
1819: Winfield Scott (Federalist)
1829: William Henry Harrison (Anti-Masonic Party)
1839: John Calhoun (New Conservative)
1849: William O. Butler (New Conservative)
1859: Gerrit Smith (Free Soil Party)
1869: Ulysses Grant (Liberal Whig)
1879: Elihu Washburne (Liberal Whig)
1889: David B. Hill (New Conservative)
1899: Wharton Barker (New Conservative)
1909: William Taft (New Conservative)
1919: Theodore Roosevelt (New Conservative)
1929: Al Smith (New Conservative/Liberal Whig)
1939: John Garner (Liberal Whig)
1949: Alfred Wagenechkt (Social Democrat)- died in office
1956: William Z. Foster (Social Democrat)
1959: Douglas MacArthur (American Party) *Right-wing replacement for center-right Liberal Whigs.
PRIME MINISTER
1789: Samuel Adams (Anti-Constitutional)
1793: Samuel Adams (Democratic-Republican)
1794: James Madison (Federalist)
1798: Alexander Hamilton (New Tory/Conservative)
1800: Thomas Jefferson (Democratic-Republican)
1803: Thomas Jefferson (Democratic-Republican)
1807: Thomas Jefferson (D-R)
1810: Aaron Burr (D-R)
1814: DeWitt Clinton (Federalist)
1817: Martin Van Buren (Whig)
1821: Henry Clay (New Conservative)
1825: Daniel Webster (Whig)
1828: Daniel Webster (Whig)
1832: John Floyd(New Conservative)
1836: James K. Polk (Whig)
1838: Hugh White (New Conservative)
1842: Martin Van Buren (Free Soil Party)
1844: James K. Polk (American Democratic)
1848: James K. Polk (American Democratic)- died in office
1849: James Buchanan (American Democratic)
1852: Martin Van Buren (Free Soil Party)
1856: Andrew J. Donelson (American Democratic)
1860: Stephen A. Douglas (New Conservative)
1861: William Seward (Liberal Whig)
1864: George-Étienne Cartier (New Conservative/American Democratic/Liberal Whig Coalition, aka the "Government of National Unity")
1868: Horace Greeley (Liberal Whig)
1872: David Davis (Tory)
1876: David Davis (Tory)
1880: John A. Logan (New Conservative)
1884: James Garfield (Northern Democrat)
1888: James Garfield (Northern Democrat/Populist coalition)
1892: James G. Blaine (Tory)
1896: William McKinley (Tory)
1900: Matthew S. Quay (New Conservative)
1904: Theodore Roosevelt (New Conservative)
1908: Theodore Roosevelt (New Conservative)
1912: Theodore Roosevelt (New Conservative)
1916: Thomas Marshall (Liberal Whig)
1920: Thomas Marshall (Liberal Whig)
1921: Mitchell Palmer (Liberal Whig)
1925: Kenesaw Mountain Landis (Liberal Whig)
1929: Franklin D. Roosevelt (Social Democratic)
1932: Franklin D. Roosevelt (Social Democratic)*dies of polio.
1935: Frank Knox (Liberal Whig)
1938: Henry Wallace (Social Democratic)
1942: Henry Wallace (Social Democratic)
1945: Thomas Dewey (Liberal Whig)
1948:Louis C. Faina (Social Democratic)
1952: Thomas Dewey (LW)
1955: Lyndon B. Johnson (Social Democratic)
1959: Charles A. Halleck (American Party)
1963: Charles A. Halleck (American Party)
1966: Gus Hall (Communist)
1967: Gus Hall (Communist) [minority government after snap election]
PRINCIPAL OF THE SENATE
1789: John Adams (Stability and Order)
1795: John Adams (Federalist)
1801: John Marshall (Federalist)
1807: George Clinton (D-R)
1813: John Marshall (Federalist)
1819: John Marshall (Federalist)
1825: William H. Crawford (New Conservative)
1831: John Quincy Adams (Whig)
1837: Willie Person Mangum (New Conservative)
1843: Willie Person Mangum (New Conservative)
1849: Lewis Cass (New Conservative)
1855: Charles Sumner (Free Soil Party)
1859: Edward Everett (New Conservative)
1865: Zachariah Chandler (Liberal Whig)
1871: William A. Wheeler (New Conservative)
1877: William A. Wheeler (Tory)*assassinated by Liberal poet George Armstrong Custer in 1879
1879: Grover Cleveland (Tory)
1885: Grover Cleveland (Tory)
1891: Levi P. Morton (Liberal Whig)
1896: William J. Bryan (Populist Party)
1900: Valentine Remmel (New Conservative)
1904: Charles Fairbanks (Tory)
1910: Charles Fairbanks (New Conservative)
1916: James M. Cox (New Conservative)
1922: Warren G Harding (New Conservative)- died in office
1923: Charles Curtis (New Conservative)
1929: Alf Landon (Liberal Whig)
1935: Frank S. Regan (Liberal Whig)
1941: Thomas Sakakihara (Social Democratic)
1947: Harold Stassen (Liberal Whig)
1953: Adlai Stevenson (Social Democratic)
1959: Adlai Stevenson (Social Democratic)
1965: Charlene Mitchell (Communist)
PRESIDENT
1789: John Hancock (No Party)
1799: Horatio Gates (New Tory/Conservative)
1809: Thomas Jefferson (D-R)
1819: Winfield Scott (Federalist)
1829: William Henry Harrison (Anti-Masonic Party)
1839: John Calhoun (New Conservative)
1849: William O. Butler (New Conservative)
1859: Gerrit Smith (Free Soil Party)
1869: Ulysses Grant (Liberal Whig)
1879: Elihu Washburne (Liberal Whig)
1889: David B. Hill (New Conservative)
1899: Wharton Barker (New Conservative)
1909: William Taft (New Conservative)
1919: Theodore Roosevelt (New Conservative)
1929: Al Smith (New Conservative/Liberal Whig)
1939: John Garner (Liberal Whig)
1949: Alfred Wagenechkt (Social Democrat)- died in office
1956: William Z. Foster (Social Democrat)
1959: Douglas MacArthur (American Party) *Right-wing replacement for center-right Liberal Whigs.
PRIME MINISTER
1789: Samuel Adams (Anti-Constitutional)
1793: Samuel Adams (Democratic-Republican)
1794: James Madison (Federalist)
1798: Alexander Hamilton (New Tory/Conservative)
1800: Thomas Jefferson (Democratic-Republican)
1803: Thomas Jefferson (Democratic-Republican)
1807: Thomas Jefferson (D-R)
1810: Aaron Burr (D-R)
1814: DeWitt Clinton (Federalist)
1817: Martin Van Buren (Whig)
1821: Henry Clay (New Conservative)
1825: Daniel Webster (Whig)
1828: Daniel Webster (Whig)
1832: John Floyd(New Conservative)
1836: James K. Polk (Whig)
1838: Hugh White (New Conservative)
1842: Martin Van Buren (Free Soil Party)
1844: James K. Polk (American Democratic)
1848: James K. Polk (American Democratic)- died in office
1849: James Buchanan (American Democratic)
1852: Martin Van Buren (Free Soil Party)
1856: Andrew J. Donelson (American Democratic)
1860: Stephen A. Douglas (New Conservative)
1861: William Seward (Liberal Whig)
1864: George-Étienne Cartier (New Conservative/American Democratic/Liberal Whig Coalition, aka the "Government of National Unity")
1868: Horace Greeley (Liberal Whig)
1872: David Davis (Tory)
1876: David Davis (Tory)
1880: John A. Logan (New Conservative)
1884: James Garfield (Northern Democrat)
1888: James Garfield (Northern Democrat/Populist coalition)
1892: James G. Blaine (Tory)
1896: William McKinley (Tory)
1900: Matthew S. Quay (New Conservative)
1904: Theodore Roosevelt (New Conservative)
1908: Theodore Roosevelt (New Conservative)
1912: Theodore Roosevelt (New Conservative)
1916: Thomas Marshall (Liberal Whig)
1920: Thomas Marshall (Liberal Whig)
1921: Mitchell Palmer (Liberal Whig)
1925: Kenesaw Mountain Landis (Liberal Whig)
1929: Franklin D. Roosevelt (Social Democratic)
1932: Franklin D. Roosevelt (Social Democratic)*dies of polio.
1935: Frank Knox (Liberal Whig)
1938: Henry Wallace (Social Democratic)
1942: Henry Wallace (Social Democratic)
1945: Thomas Dewey (Liberal Whig)
1948:Louis C. Faina (Social Democratic)
1952: Thomas Dewey (LW)
1955: Lyndon B. Johnson (Social Democratic)
1959: Charles A. Halleck (American Party)
1963: Charles A. Halleck (American Party)
1966: Gus Hall (Communist)
1967: Gus Hall (Communist) [minority government after snap election]
PRINCIPAL OF THE SENATE
1789: John Adams (Stability and Order)
1795: John Adams (Federalist)
1801: John Marshall (Federalist)
1807: George Clinton (D-R)
1813: John Marshall (Federalist)
1819: John Marshall (Federalist)
1825: William H. Crawford (New Conservative)
1831: John Quincy Adams (Whig)
1837: Willie Person Mangum (New Conservative)
1843: Willie Person Mangum (New Conservative)
1849: Lewis Cass (New Conservative)
1855: Charles Sumner (Free Soil Party)
1859: Edward Everett (New Conservative)
1865: Zachariah Chandler (Liberal Whig)
1871: William A. Wheeler (New Conservative)
1877: William A. Wheeler (Tory)*assassinated by Liberal poet George Armstrong Custer in 1879
1879: Grover Cleveland (Tory)
1885: Grover Cleveland (Tory)
1891: Levi P. Morton (Liberal Whig)
1896: William J. Bryan (Populist Party)
1900: Valentine Remmel (New Conservative)
1904: Charles Fairbanks (Tory)
1910: Charles Fairbanks (New Conservative)
1916: James M. Cox (New Conservative)
1922: Warren G Harding (New Conservative)- died in office
1923: Charles Curtis (New Conservative)
1929: Alf Landon (Liberal Whig)
1935: Frank S. Regan (Liberal Whig)
1941: Thomas Sakakihara (Social Democratic)
1947: Harold Stassen (Liberal Whig)
1953: Adlai Stevenson (Social Democratic)
1959: Adlai Stevenson (Social Democratic)
1965: Charlene Mitchell (Communist)
