Dizzying Amounts of Money Pour Into the Biden and Trump Campaigns

Mr. Biden’s June virtual fund-raising calendar was punctuated by major events headlined by former President Barack Obama, Senator Elizabeth Warren of Massachusetts and Senator Kamala Harris of California. But he was also hosted by leading Wall Street figures, including Hamilton E. James, the executive vice chairman of the Blackstone Group, and Hollywood titans like Jeffrey Katzenberg, the film producer.

Helping pad Mr. Biden’s recent hauls has been the fact that, as the presumptive nominee, he can raise money in tandem with the Democratic National Committee, swelling the size of checks he can accept from $2,800 during the primary to more than $620,000 now. Mr. Trump has been raising such $500,000-plus checks for months, including some at a small dinner in June that raised $10 million.

In fact, Mr. Biden’s June fund-raising haul was so large that, as the end of the month neared, a signal was received by some donors to hold their checks until July, according to two people familiar with the matter.

The sums that both campaigns took in last month were enormous historically. Mrs. Clinton did not raise $140 million until two months deeper in the cycle, in August 2016. That year, Mr. Trump never raised as much in a month as he did in June 2020. And the totals for both campaigns this June were greater than President Barack Obama and Mitt Romney posted in June 2012.

Mr. Biden’s campaign highlighted that it had added 2.6 million people to his email list in June, and that 68 percent of his contributors last month were new to his campaign. In May, half of Mr. Biden’s contributors were new, too, as the party base unified behind him.

“The enthusiasm is reflected both in polls and the fund-raisers,” said David Cohen, a top Comcast executive who hosted Mr. Biden’s first fund-raiser on the day he entered the race. “Right now, Joe Biden has an appeal. People in this country are tired about being embarrassed about this president.” Mr. Cohen added that there had been “a bit of a stampede at the grass-roots level.”

The Biden team is looking for even more. The campaign has recently been shopping around to find a new vendor that would replace the firm Anne Lewis Strategies to find new supporters online, according to people familiar with the matter.