Here are some Presidential Lists from potential TL's and TL ideas I've had, that I'm hoping to do someday. I'm posting them here now because some of the ideas here have been gotten to first by other TL's. I'm always a little disappointed when that happens. So, here they are! 
Fields of Roses: A Roosevelt Dynasty TL
Theodore Roosevelt [R] (1913-1921)
James M. Cox [D] (1921-1925)
Franklin Delano Roosevelt [D] (1925-1933)
Theodore Roosevelt Jr. [R] (1933-1941)
Quentin Roosevelt [R] (1941-1949)
Thomas E. Dewey [R] (1949-1953)
Eleanor Roosevelt [D] (1953-1961)
Don't Let It Be Forgot: A Kennedy Dynasty TL
John F. Kennedy [D] (1961-1963)
Lyndon B. Johnson [D] (1963-1969)
Robert F. Kennedy [D] (1969-1977)
Nelson A. Rockefeller [R] (1977-1981)
Edward M. Kennedy [D] (1981-1989)
Charlton Heston [R] (1989-1997)
Albert A. Gore [D] (1997-2001)
Willard Mitt Romney [R] (2001-2009)
John F. Kennedy Jr. [D] (2009-2017)
No Vice, No Virtue - A Goldwater TL
Lyndon B. Johnson [D] (1963-1969)
Barry M. Goldwater [R] (1969-1977)
Ronald Reagan [R] (1977-1981) [1]
Edward M. Kennedy [D] (1981-1989)
Ronald E. Paul [R] (1989-1993) [2]
Barry M. Goldwater Jr. [R] (1993-2001) [3]
William J. Clinton [D] (2001-2009)
Hilary Rodham-Goldwater [R] (2009-2017) [4]
[1] Barry Goldwater's Vice President
[2] Declines to run for second term
[3] Ron Paul's Vice President
[4] Wife and former First Lady of Barry Goldwater Jr.
[5] It should also be noted that the election of 2004 is between Clinton and Rodham-Goldwater!
Twilight In America - The Assassination of Ronald Reagan
Ronald Reagan [R] (1981) [1]
George H. W. Bush [R](1981-1985)
Walter Mondale [D] (1985-1989)
Patrick Robertson [R] (1989-1992) [2]
Patrick Buchanan [R] (1992-1993)
Ross Perot (1993-1997)
William J. Clinton [D] (1997-2000) [3]
Albert A. Gore [D] (2000-2001)
George W. Bush [R] (2001) [4]
Dick Cheney [R] (2001-2005) [5]
Donald Rumsfeld [R] (2005-2009)
Ralph Nader [G] (2009-)
[1] Assassinated
[2] Impeached
[3] Impeached
[4] Killed in 9/11 type attack
[5] Dies of heart attack
Fields of Roses: A Roosevelt Dynasty TL
Theodore Roosevelt [R] (1913-1921)
James M. Cox [D] (1921-1925)
Franklin Delano Roosevelt [D] (1925-1933)
Theodore Roosevelt Jr. [R] (1933-1941)
Quentin Roosevelt [R] (1941-1949)
Thomas E. Dewey [R] (1949-1953)
Eleanor Roosevelt [D] (1953-1961)
Don't Let It Be Forgot: A Kennedy Dynasty TL
John F. Kennedy [D] (1961-1963)
Lyndon B. Johnson [D] (1963-1969)
Robert F. Kennedy [D] (1969-1977)
Nelson A. Rockefeller [R] (1977-1981)
Edward M. Kennedy [D] (1981-1989)
Charlton Heston [R] (1989-1997)
Albert A. Gore [D] (1997-2001)
Willard Mitt Romney [R] (2001-2009)
John F. Kennedy Jr. [D] (2009-2017)
No Vice, No Virtue - A Goldwater TL
Lyndon B. Johnson [D] (1963-1969)
Barry M. Goldwater [R] (1969-1977)
Ronald Reagan [R] (1977-1981) [1]
Edward M. Kennedy [D] (1981-1989)
Ronald E. Paul [R] (1989-1993) [2]
Barry M. Goldwater Jr. [R] (1993-2001) [3]
William J. Clinton [D] (2001-2009)
Hilary Rodham-Goldwater [R] (2009-2017) [4]
[1] Barry Goldwater's Vice President
[2] Declines to run for second term
[3] Ron Paul's Vice President
[4] Wife and former First Lady of Barry Goldwater Jr.
[5] It should also be noted that the election of 2004 is between Clinton and Rodham-Goldwater!
Twilight In America - The Assassination of Ronald Reagan
Ronald Reagan [R] (1981) [1]
George H. W. Bush [R](1981-1985)
Walter Mondale [D] (1985-1989)
Patrick Robertson [R] (1989-1992) [2]
Patrick Buchanan [R] (1992-1993)
Ross Perot (1993-1997)
William J. Clinton [D] (1997-2000) [3]
Albert A. Gore [D] (2000-2001)
George W. Bush [R] (2001) [4]
Dick Cheney [R] (2001-2005) [5]
Donald Rumsfeld [R] (2005-2009)
Ralph Nader [G] (2009-)
[1] Assassinated
[2] Impeached
[3] Impeached
[4] Killed in 9/11 type attack
[5] Dies of heart attack