Sanders has the donors, Biden leads polls in Tuesday primary states

Sen. Cory Booker (D-N.J.) endorsed former Vice President Joe Biden on Monday in Michigan. (Photo by Mandel Ngan/AFP via Getty

Low on cash and delegates, Warren ends her White House bid

(Drew Angerer/Getty Images) Sen. Elizabeth Warren (D-Mass.) suspended her campaign Thursday, ending a White House bid highlighted by fierce debate

Warren, Biden likely to see biggest fundraising boost from Buttigieg exit

(SAUL LOEB/AFP via Getty Images) Former South Bend, Ind., Mayor Pete Buttigieg suspended his campaign Sunday, ending an unexpectedly successful

South Carolina donors give the greatest amount to Biden as Sanders cuts into the lead

(Sean Rayford/Getty Images) Former Vice President Joe Biden is placing his bets on a state that is his stronghold, South

Biden dominates with Nevada donors ahead of caucus

(John Tlumacki/The Boston Globe via Getty Images) Democratic presidential candidates who received the greatest amount of  donations from Iowa and

Will donors to Cory Booker move to other 2020 Democrats?

Sen. Cory Booker (NICHOLAS KAMM/AFP via Getty Images) Sen. Cory Booker (D-N.J.) shares thousands of donors with several presidential candidates,

Luxury hotel stays, private flights, new nonprofits: Leadership PACs can pay for them

(Gonzalo Marroquin/Patrick McMullan via Getty Images) Designed primarily to provide funding for other candidates running for office, leadership PACs are

Castro, Booker have highest proportion of contributions from Iowa women

Julian Castro, former housing secretary (left) and Sen. Cory Booker (D-N.J.) each receive more than 60 percent of their Iowa

Big-dollar donors helped Deval Patrick lay groundwork for presidential campaign

Deval Patrick, Former Governor of Massachusetts (Michael Brochstein/SOPA Images/LightRocket via Getty Images) Former Massachusetts Gov. Deval Patrick is making a