1804: 85.7% Thomas Jefferson
1808: 50.0% George Clinton
1816: 69.2% James Monroe
1820: 60.0% James Monroe
1828: 48.0% John Q. Adams
1844: 50.0% James Birney
1864: 71.4% Abraham Lincoln
1872: 65.4% Ulysses Grant
1896: 32.5% John Palmer
1952: 63.9% Dwight Eisenhower
1964: 49.2% Lyndon Johnson
1968: 44.4% Hubert Humphreyhttp://en.wikipedia.org/wiki/United_States_presidential_election,_1944Just to clarify about third parties, the third party has to get at least .25% of the total popular vote in order to show up in the options, otherwise choose the "other/write-in" option.
Dewey unenthusiastically, or write-in Robert Taft. Not sure which one yet.