alternatehistory.com

...and a list of Presidents and NYC Mayors, of course.

2001-2005: George W. Bush / Richard B. Cheney (Republican)
2000 def. Al Gore / Joe Lieberman (Democratic), Ralph Nader / Winona LaDuke (Green)
2005-2009: Richard Gephardt / Shannon O'Brien (Democratic)
2004 def. George W. Bush / Richard B. Cheney (Republican)
2009-2013: William Frist / Chuck Hagel (Republican)
2008 def. Richard Gephardt / Shannon O'Brien (Democratic), Ralph Nader / Matt Gonzales (Green)
2013-: Kathleen K. Townsend / Rod Blagojevich (Democratic)
2012 def. William Frist / John S. McCain (Republican), Michael Bloomberg / Erskine Bowles (Unity2012)

1994-2001: Rudy Giuliani (Republican-Liberal)
1994 def. David Dinkins (Democratic)
1997 def. Ruth Messinger (Democratic)
2002-2010: Freddy Ferrer (Democratic-Working Families)
2001 def. Michael Bloomberg (Republican-Independence)
2005 def. Herman Badillo (Republican-'Safe Streets')
2010-2012: Anthony Weiner (Democratic-Working Families)
2009 def. Bruce Blakeman (Republican-Conservative), Jimmy McMillan (Independent)
2012-2014: Letita James (Democratic-Working Families)
2014-: Tony Danza (Republican-Conservative)
2014 def. Scott Stringer (Democratic), Letita James (Working Families)