Kammala wannan jumla: Babban dan takarar da ya fara kaddamar da takarar su shine Mike Gravel a watan Afrilun 2006. Duk da haka, a mafi yawan bangarorin, tseren don zaben shugaban kasa na 2008 bai fara ba da gaske har sai bayan zaben tsakiyar shekara ta 2006. Tsakanin Nuwamba 2006 da Fabrairu 2007, manyan 'yan takara takwas sun bude kamfen din su: Joe Biden, Hillary Clinton, Chris Dodd, John Edwards, Dennis Kucinich,
Barack Obama, Bill Richardson, da kuma Tom Vilsack. 'Yan takarar da za su iya zama John Kerry, Al Gore, Russ Feingold, Evan Bayh, Tom Daschle, Wesley Clark, Sam Nunn, Mark Warner, da Al Sharpton sun yi la'akari da gudu amma a ƙarshe sun ƙi neman takarar. Vilsack ya fita a watan Fabrairun shekara ta 2007.