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
Tom Steyer (Justin Sullivan/Getty Images) Billionaire investor and Democratic megadonor Tom Steyer’s massive spending on TV ads in two early