Take a peek inside CNN's massive library system and view archival video of winning U.S. presidential campaigns as they kicked off on television.
Presidents Barack Obama, George W. Bush and Bill Clinton are among those featured in the video clip from CNN's video vault.[cnn-videoÂ url="http://www.cnn.com/video/#/video/politics/2011/04/04/vault.past.pres.annoucements.cnn"%5D
Obama is the first candidate to officially launch a campaign for the 2012 presidential election.
View his team's campaign message, released Monday, on BarackObama.com.