Published: Jun 26, 2012 12:07 PM EDT

BOSTON (AP) - President Barack Obama is hauling in millions of dollars for his re-election bid as he warns that Democrats will face a fundraising onslaught from Republicans during the fall campaign.
    
Obama was collecting more than $2.3 million at fundraisers in Atlanta and Miami on today following top-dollar events Monday night in Boston.
    
Republican Mitt Romney raised more than $76 million last month for his presidential campaign and the Republican party, and Obama's advisers expect Republican-leaning super PACs to pull in $1.2 billion before the election, posing a big-money challenge for the president.
    
Obama told supporters in New Hampshire on Monday that through November "the other side will spend more money than at any time in American history."