Candidates: Biden • Clinton (campaign, views) • Dodd • Edwards (campaign, views) • Gravel (campaign, views) • Kucinich • Obama (campaign, views) • Richardson
Potential candidates: Clark • Gore
Withdrawn candidates: Vilsack
Candidates: Brownback • Cox • Gilmore • Giuliani (campaign, views) • Huckabee • Hunter • McCain (campaign, views) • Paul (campaign, views) • Romney (campaign, views) • Tancredo • F. Thompson (views) • T. Thompson
Potential candidates: Coburn • Gingrich • Hagel
Third party candidates: Amondson (Prb.) • Augustson (Grn.) • E. Brown (Grn.) • Corsi (Con) • Imperato (Template:Libertarian Party (United States)/meta/linkedabbr) • B. Jackson (Template:Libertarian Party (United States)/meta/linkedabbr) • Kubby (Template:Libertarian Party (United States)/meta/linkedabbr) • Mesplay (Grn.) • Milnes (Template:Libertarian Party (United States)/meta/linkedabbr) • Parker (IGVA) • Phillies (Template:Libertarian Party (United States)/meta/linkedabbr) (Campaign) • Root (Template:Libertarian Party (United States)/meta/linkedabbr) • Schriner • C Smith (Template:Libertarian Party (United States)/meta/linkedabbr) • Swift (Grn.) • D. Thompson (Template:Constitution Party (United States)/meta/linkedabbr)