U.S. President Barack Obama's re-election campaign urged top fundraisers to support a Democratic-leaning outside group that is backing his bid for a second term, reversing Obama's opposition to "super" political action committees that can spend unlimited amounts of cash to influence elections.

Obama's campaign encouraged wealthy fundraisers in a Monday night conference call to support Priorities USA, a super PAC led by two former Obama aides that has struggled to compete with the tens of millions of dollars collected by Republican-backed outside groups. Campaign aides said Tuesday that the president had personally signed off on the decision.

Obama's campaign encouraged wealthy fundraisers in a Monday night conference call to support Priorities USA, a super PAC led by two former Obama aides. (Larry Downing/Reuters)

Obama has opposed the Supreme Court's 2010 decision in the Citizens United case that stripped away some limits on campaign contributions, calling the money a "threat to our democracy." The new super PACs can't co-ordinate directly with campaigns, but many have played a major role in the Republican primary contests by raising millions of dollars to use in negative advertising in early contests in Iowa, South Carolina and Florida.

By putting strategy above all else, Obama faced criticism that he had compromised on principle and had succumbed to the rules of the same Washington game he pledged to change. Yet in a plea to supporters, campaign manager Jim Messina said it would be unfair and unwise for the president's re-election effort to live under one set of rules while the Republican presidential nominee benefits from the new fundraising landscape.

"We decided to do this because we can't afford for the work you're doing in your communities, and the grassroots donations you give to support it, to be destroyed by hundreds of millions of dollars in negative ads," Messina said.

Messina said senior campaign officials, along with some White House officials and members of Obama's cabinet, would attend and speak at fundraising events for Priorities USA but would not directly ask for money. He said Obama, vice-president Joe Biden and the president's wife Michelle Obama would not be part of the effort and would remain focused on Obama's campaign.

'Just another broken promise'

Obama's decision was criticized by proponents of campaign finance reform and Democrats who said it would undermine the president's message to party loyalists.

Former senator Russ Feingold, (D-Wis.), a longtime advocate for campaign finance reform, said the decision would "gut a winning, progressive strategy. When Democrats play by Republican rules, people see our party as weak, and a false alternative to the power of rich individual and corporate interests that are increasingly dominating our government."

Republicans criticized the Obama campaign's embrace of the outside groups, calling it a hypocritical shift by Obama after he chided the influence of secret, special-interest money.

"Just another broken promise," Republican House Speaker John Boehner, said of Obama's decision.

The decision to promote the outside Democratic group came after new fundraising reports revealed a large disparity against Republican super PACs. American Crossroads and Crossroads GPS, two groups tied to Republican strategist Karl Rove, raised $51 million last year while major Democratic groups, including Priorities USA Action, collected $19 million last year.

Democrats have raised concerns about the potential of the super PACs to dominate the airwaves with negative advertising in the general election. Obama campaign senior strategist David Axelrod told reporters last month that the "prospect of hundreds of millions of dollars of negative ads raining down on us is not a prospect that I relish." But he said then that Obama was "thoroughly known to the American people" and would be less susceptible to an onslaught of tough ads.

Underscoring the concerns, the first ad aired by the Obama campaign defended the president's record on energy and ethics. It came in response to a hard-hitting ad aired by Americans for Prosperity, a group connected to billionaires Charles and David Koch, that accused the president of using taxpayer money to benefit political donors at bankrupt energy company Solyndra.

In a weekend interview, Obama bemoaned the influence of big money in presidential campaigns and said he expected many of the 2012 campaign ads funded by super PACs to be negative. But he also said the Supreme Court's decision had made outside money an unavoidable part of the political process.

"It is very hard to be able to get your message out without having some resources," Obama told NBC News.

The new super PACs can't co-ordinate directly with campaigns, but many that are active in this election are staffed by longtime supporters or former aides of the candidates.

Obama's campaign also said Monday it is returning about $200,000 in contributions collected by family members of a Mexican casino owner who fled the U.S. after facing drug and fraud charges.

The campaign said it had decided to return the donations arranged by Chicago brothers Carlos Cardona and Alberto Rojas Cardona, who had begun raising money for the campaign and the Democratic National Committee last year.

The New York Times reported late Monday that the fundraisers are the brothers of casino owner Juan Jose Rojas Cardona, who skipped bail in Iowa in 1994 and has since been linked to violence and corruption in Mexico.

The campaign said it refunded the money raised by family members after the newspaper asked about the brothers' fundraising role. Obama campaign officials said they were identifying donations bundled by other people connected to Cardona, expected to be about $100,000, and would return those funds as well.