White House senior adviser David Plouffe on Tuesday explained that presumptive Republican presidential nominee Mitt Romney had raised massive amounts of money in June because rich people were "trying to purchase the White House."

During an interview on ABC, host George Stephanopoulos asked Plouffe if President Barack Obama was on track to lose after Romney raised $35 million more than him last month.

"Money matters in politics," Plouffe said. "We're running a great campaign. We have millions of volunteers out there registering voters, donating 25 or 50 dollars. But you have to have enough money to run and win your campaign."

"And our big concern is these super PACs," he added. "You've got a few wealthy people lining up trying to purchase the White House for Mr. Romney."

Over the weekend, Romney raised millions of dollars in a single day by holding three fundraisers at the homes of wealthy donors in the Hamptons, including a mansion owned by conservative billionaire David Koch.

"I don't think the common person is getting it," one donor reportedly said. "[M]y college kid, the baby sitters, the nails ladies -- everybody who's got the right to vote -- they don't understand what's going on. I just think if you're lower income -- one, you're not as educated, two, they don't understand how it works, they don't understand how the systems work, they don't understand the impact."

Watch this video from ABC's Good Morning America, broadcast July 10, 2012.

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