Millard Fillmore (1850-1853) of the Whig Party was the last third party candidate to be elected president.
See also this convenient Wikipedia page: http://en.wikipedia.org/wiki/List_of_United_States_Presidents_by_political_affiliation
She was Republic party nominee John McCain's vice-presidential candidate in the 2008 election. She has not sought election as president, though many speculate that she may in the future.
Yes
There has never been any true third party candidates that have been elected to presidential office. The two main parties are the democrats and the republicans.
yes
1800 & 1824
James Baird Weaver (June 12, 1833 - February 6, 1912) never became President of the United States.He did, however, run for President twice on third-party tickets.1st as the presidential nominee of the Greenback Party in 1880.2nd as the presidential nominee of the People's (Populist) Party - a party he helped create - in 1892.
Yes, there have been protests following presidential elections in the United States.
never
Hillary Clinton was not on the ballot in the 2008 general election. Democratic Party candidate Barack Obama won the 2008 presidential election defeating Republican Party candidate John McCain.
No US Presidential election has ever been delayed or cancelled, but in theory it could happen. It would require an overwhelming emergency which makes it impossible to proceed with an election. Nuclear war would probably do it.
It was the only U. S. Presidential election in which one of the candidates had previously won two other U. S. Presidential elections. That candidate was Franklin D. Roosevelt, who won his third presidential election in 1940... and his fourth in 1944. The 22nd Amendment to the U. S. Constitution, ratified in February, 1951, made sure that wouldn't happen again (unless, of course, the amendment gets repealed in the future).
yes, in the election of 1800 thomas Jefferson and john Adams