Democratic Party
Candidates featured in major polls: Barack Obama
Republican Party
Candidates featured in major polls: Mitt Romney
Withdrew during primaries: Michele Bachmann | Jon Huntsman | Rick Perry | Rick Santorum | Newt Gingrich | Ron Paul
Withdrew before primaries: Herman Cain | Gary Johnson | Thaddeus McCotter | Tim Pawlenty
Other third parties:
Candidates featured in major polls: Gary Johnson (Libertarian Party) | Jill Stein (Green Party) | Virgil Goode (Constitution Party) | Rocky Anderson (Justice Party)
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