(CNN) - Priorities USA Action, a super PAC supporting President Barack Obama's re-election campaign, said Friday it brought in $6.1 million in June, closing off the second quarter with $11.7 million total raised.
The June figure topped its May haul of $4 million, but it's unclear yet if it raised more this month than the pro-Mitt Romney super PAC, Restore Our Future, which outpaced Priorities in fund-raising last month at $4.96 million.
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As of mid-June, the Democratic group had spent $15 million to help re-elect Obama. The bulk of the spending from the pro-Obama group, which is run in part by former Obama White House aides, came in a five-state television ad campaign focusing on Mitt Romney's tenure as chief executive of Bain Capital. The group spent $10 million to air the spots in Colorado, Florida, Ohio, Pennsylvania and Virginia, all battleground states.
It has also paired up with the labor union Service Employees International Union (SEIU) to push multiple Spanish-language ads on radio and television.
The group argued in a campaign memorandum released Wednesday that recent polling shows their advertising strategies are working. Priorities said internal polling indicates that millions of dollars spent in support of Obama is helping him and hurting presumptive Republican nominee Romney in some key states.
Separately, a recent USA Today/Gallup Poll showed that three quarters of those surveyed in battleground state voters who say a political ad has shifted their opinion in the presidential race say they now support Obama and 16% say they are leaning towards Romney.
"The effectiveness of our ads has had an impact on how voters view Mitt Romney and on the pace of our donations," said Bill Burton, the group's senior strategist, in a statement. "While we will never be able to match Karl Rove and the Koch Brothers dollar-for dollar, Democratic donors recognize the importance of making sure voters know the catastrophic consequences Mitt Romney would have on the middle class."
– CNN Political Editor Paul Steinhauser and CNN's Kevin Liptak contributed to this report.