Candidate's lone primary victory in American Samoa, beating even local-born Tulsi Gabbard, was an unorthodox and inauspicious culmination to a much-hyped but short-lived campaign

Progressive US senator has been outperformed by Bernie Sanders, had poor showing this week that included losing her home state of Massachusetts

Former NYC mayor who spent hundreds of millions on unprecedented ad campaign quits after dismal showing in primaries, as race effectively whittled down to Biden versus Sanders

Former vice president scoops up victories on Super Tuesday as party members drift toward seeing him as best alternative to liberal firebrand Sanders

Move comes after billionaire spent unprecedented sums of money in TV ads that got him nowhere on Super Tuesday, though he is still buying new ads and scheduling campaign events

Despite early markers of success, progressive US senator has struggled to win over fan base of Bernie Sanders, leading to poor numbers; says she's not dropping out yet, though

Vermont senator also claims home state, Utah and Colorado; former VP takes Virginia, North Carolina, Oklahoma, Massachusetts, Alabama, Tennessee and Arkansas; no wins for Warren

Sanders grabs a home-state win in Vermont; voting ongoing in the two biggest prizes of the night, Texas and California; Tennessee voting extended after tornadoes

Leading candidates to face off against Trump look to rack up delegates ahead of party convention; Bloomberg appears on ballots for first time

Former US vice president hopes to turn South Carolina victory into national movement, but also faces challenge by Michael Bloomberg, who is testing his strength for the first time