Data released this week provide the most detailed look yet at who funds the Democratic contenders. We mapped more than 4.5 million donations. Here's what we found.
Before we break it down, explore your area
Find out which of the top six fundraisers raked in the most
Where the cash comes from
Most of the checks come from coastal cities like New York and Los Angeles, where many donors are spreading their money and giving to multiple campaigns.
The top fundraisers, however, have built up strongholds elsewhere. The maps below show the amount of money raised per person, highlighting the highest concentrations of support.
What we're seeing
The new data come from ActBlue, a clearinghouse for small donations available to all Democratic candidates, and offers insight into the donor base of each.
We looked at the six candidates who have raised more than $10 million and here's what we learned.
Bernie SandersSenator from Vermont
The top fundraiser so far, Sanders has significant support from his home state of Vermont and neighboring New Hampshire, but following the pattern of the 2016 campaign his broad base stretches all across America.
Sanders is trailing Sen. Kamala Harris in her home state of California, but has done well enough in rural Northern California and the Central Valley to outraise Mayor Pete Buttigieg and the other Democratic challengers.
Pete ButtigiegMayor of South Bend, Ind.
Buttigieg has done especially well among Midwestern donors, reaping large sums from his home state of Indiana as well as nearby Chicago and the Twin Cities of Minneapolis and St. Paul.
The most successful LGBTQ candidate for president has done well in gay meccas like West Hollywood, Palm Springs and Provincetown, Mass.
Elizabeth WarrenSenator from Massachusetts
Warren has found broad support from donors across the country, though to a lesser degree than Sanders.
She's done well in some elite quarters like Cambridge, Mass., where she once served as a Harvard professor, but has yet to surpass the top fundraisers in other areas.
Kamala HarrisSenator from California
Harris has done well in her home state of California, where she served as the state's attorney general before being elected to the U.S. Senate.
The wealthy Westside of Los Angeles, which Harris now calls home, has put millions into her career, which started in the San Francisco Bay Area. Donors there in San Francisco and Oakland have been strong supporters of her bid for the presidency.
Joe BidenFormer vice president
With more than $2.6 million from the Sunshine State, Biden outshines his Democratic rivals in Florida.
He's also leading in his birth state of Pennsylvania, where he's pulled in hundreds of thousands of dollars from donors in Philadelphia and surrounding suburbs, as well as Delaware, which he represented for decades in the U.S. Senate.
Beto O'RourkeFormer congressman from Texas
Despite running one of the most successful fundraising efforts in congressional history, O'Rourke has struggled to compete outside of his home state of Texas.
His strongest support so far has come from his hometown of El Paso and major cities in the state like Houston and Dallas.
Additional work by Ben Welsh