Hillary Rodham Clinton, who entered the race for the Democratic presidential nomination with the potent advantages of name and history, showed signs of erosion in her fund-raising efforts on Wednesday, with Senator Bernie Sanders of Vermont, her chief rival, quickly gaining financial ground during the last three months.
Mrs. Clinton, who has been able to tap into one of the most successful fund-raising networks in American politics, reported raising more than $28 million for her primary campaign since the beginning of July, while Mr. Sanders, who has largely eschewed fund-raising from large donors, reported raising more than $24 million.
The gap — comparable to Mrs. Clinton’s lead over Barack Obama, then a senator, during the same period in the 2008 Democratic primary, which Mr. Obama won — highlights the shift in fund-raising momentum that has occurred in the race since the last fund-raising reports.
Aides to Mrs. Clinton said that her total was within their projections, and they maintained that, aside from incumbent presidents, no other candidate has raised as much during the comparable three months of a campaign.

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But the amount Mrs. Clinton raised also reflected a sharp drop from her cash haul reported over her few months in the race, when she brought in a total of $47.5 million, almost all of it for the primary campaign.
That decrease reflects not only the traditional summer slowdown on the fund-raising circuit but the growing possibility that another Democrat popular among the party’s major donors, Vice President Joseph R. Biden Jr., might enter the race.
Perhaps more strikingly, Mr. Sanders is rapidly rewriting the rules for big-money fund-raising in a presidential campaign. He raised his $24 million with only a handful of fund-raising events. And while precise figures will not be available until the campaigns file formal paperwork with the Federal Election Commission this month, Mr. Sanders appears to be relying overwhelmingly on donors making small contributions.
“We are sending a message to the billionaire class,” Mr. Sanders said on Twitter on Wednesday. “Your greed is going to end and we’re going to end it for you.”
Mr. Sanders has even outpaced Mr. Obama’s record-breaking campaign from 2008, reaching more than a million online contributions — …Read More