The Democrats vying to be Joe Biden's running mate have made the rounds of the Sunday shows. They've enlisted surrogates to talk them up to the vetting committee and have been preparing for their one-on-one interviews with Biden himself.

But as the vetting process enters its final stage, there's another lesser-noticed facet to the veepstakes: how much cash the contenders have raised for him, and their ability to juice donations if they're chosen.

Of Biden's prospective running mates, Sen. Elizabeth Warren has brought in the most money for him, totaling more than $7.7 million combined from a high-dollar event — which she vocally swore off during her own campaign — and a grassroots event that drew 50,000 participants. She's also sent multiple emails to her own small-dollar list, as well as his. On Tuesday, Warren will host another event for Biden, alongside Rep. Katie Porter (D-Calif.), with tickets ranging from $250 to $25,000, according to an invitation obtained by POLITICO.

Sen. Kamala Harris — who headlined two fundraisers alongside Biden and appeared at several other events — has raised more than $5 million, according to a source familiar with the total. And Sen. Tammy Duckworth has co-headlined three fundraisers with Joe and Jill Biden, and appeared at other events, bringing in more than $3 million for the campaign.