evidence: Democrats united behind Vice President Kamala Harris as the party's front-runner for the presidential nomination Monday, and their excitement translated into a juggernaut day of fundraising for the party and for Harris' campaign. [...] While not yet formally the party's presumptive nominee, Harris' position as frontrunner is rock solid, and no potential challengers have signaled they intend to vie for the nomination. In the hours since President Joe Biden announced that he would end his teetering reelection campaign, Harris and the Democratic party have pulled in roughly $250 million in online donations and major donor commitments.