![Illinois senator Barack Obama waves to the crowd before he a Illinois senator Barack Obama waves to the crowd before he a](https://api.time.com/wp-content/uploads/2015/03/presidential-candidacy-announcements-barack-obama.jpg?quality=85&w=2400)
By TIME Staff
![Mitt Romney Mitt Romney](https://api.time.com/wp-content/uploads/2015/03/presidential-candidacy-announcements-mitt-romney.jpg?quality=75&w=2400)
![John McCain, Cindy McCain John McCain, Cindy McCain](https://api.time.com/wp-content/uploads/2015/03/presidential-candidacy-announcements-john-mccain.jpg?quality=75&w=2400)
![Illinois senator Barack Obama waves to the crowd before he a Illinois senator Barack Obama waves to the crowd before he a](https://api.time.com/wp-content/uploads/2015/03/presidential-candidacy-announcements-barack-obama.jpg?quality=75&w=2400)
![Hillary Rodham Clinton Hillary Rodham Clinton](https://api.time.com/wp-content/uploads/2015/03/presidential-candidacy-announcements-hillary-clinton.jpg?quality=75&w=2400)
![KERRY KERRY](https://api.time.com/wp-content/uploads/2015/03/presidential-candidacy-announcements-john-kerry.jpg?quality=75&w=2400)
![GORE GORE](https://api.time.com/wp-content/uploads/2015/03/al-gore-presidential-campaign.jpg?quality=75&w=2400)
![Gov. George W. Bush, of Texas, launching his presidential ca Gov. George W. Bush, of Texas, launching his presidential ca](https://api.time.com/wp-content/uploads/2015/03/presidential-candidacy-announcements-george-bush.jpg?quality=75&w=2400)
![Bill Clinton Announces Presidential Candidacy Bill Clinton Announces Presidential Candidacy](https://api.time.com/wp-content/uploads/2015/03/presidential-candidacy-announcements-bill-clinton.jpg?quality=75&w=2400)
![Bush Announces Candidacy 1987 Bush Announces Candidacy 1987](https://api.time.com/wp-content/uploads/2015/03/presidential-candidacy-announcements-george-bush-sr.jpg?quality=75&w=2400)
![Ronald Regan and Nancy Reagan Ronald Regan and Nancy Reagan](https://api.time.com/wp-content/uploads/2015/03/presidential-candidacy-announcements-ronald-reagan.jpg?quality=75&w=2400)
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