Howard Dean.
Hillary Clinton, wife of Bill Clinton made a serious run in the primaries for the presidential nomination.
George H. W. Bush ran against Ronald Reagan in the 1980 Republican primaries, but lost. Bush would eventually become Reagan's Vice President.
primaries
46 when he took office. So when he was running he was 45 or 46... depending when he started (or the the definition of running for president.. does it include the primaries??)
Bush ran Twice. First in 2000 and then in 2004. He won both times.
party primaries
10 primaries and caususes
Modified primaries refer to elections where the rules have been altered to allow certain types of voters, such as independents, to participate in the primary election process. This modification can vary by state and can include open primaries, semi-closed primaries, or semi-open primaries. The aim is to broaden participation and potentially increase voter turnout.
George Romney ran for, but failed to win, the Republican nomination in 1964 and 1968, receiving the votes of just 3% of the delegates in '64 and 4% in '68. His son Mitt Romney won the Republican nomination in 2012 but lost the election.
closed primaries prevent "crossover voting"; open primaries allow it, which can produce nominees that don't represent the values of the party
Before he was President, Obama was a US Senator . He earlier served in the Illinois State Senate. Of course he ran in primaries before he was nominated the first time and gained experience from that.