William
The first Whig party candidate to win the presidency was William Henry Harrison. However, he had the shortest term in office as he died just 32 days into his presidency.
William Henry Harrison
Yes, but no, the republican party first won a presidency in Abrahm Lincoln, but this was a fragmentation of a larger party.
A third party candidate might win presidency because in this system, rather than voting for one and only one candidate, you can vote for as many candidates as you want.
Republican party candidate nominated for for presidency
selecting the party's candidate for presidency
Al Smith was the first Catholic candidate for a regular political party who did not win the election.
That was the Green Party with their candidate Ralph Nader.
Abraham Lincoln
Teddy Roosevelt's election to the Presidency
A third party candidate might win presidency because in this system, rather than voting for one and only one candidate, you can vote for as many candidates as you want.
Victoria Woodhull was the Equal Rights Party's candidate for President in the 1872 election.
The candidate for the Democratic-Republican Party in the election of 1796 was Thomas Jefferson. He ran against John Adams of the Federalist Party and ultimately became the vice-president after Adams won the presidency.