Sen. Elizabeth Warren (D-Mass.), and Sen. Amy Klobuchar (D-Minn.) (Sean Rayford/Getty Images) Ahead of the critical Nevada caucuses Saturday, Sens.
(John Tlumacki/The Boston Globe via Getty Images) Democratic presidential candidates who received the greatest amount of donations from Iowa and
Joe Biden speaks during a campaign event in Manchester, New Hampshire. (Scott Eisen/Getty Images) Former Vice President Joe Biden is
Former South Bend, Indiana Mayor Pete Buttigieg listens as Sen. Bernie Sanders makes a point during the January Democratic presidential
Ahead of the 2020 primaries, Joe Biden, Bernie Sanders and Pete Buttigieg all find themselves supported by outside groups (Scott