Two juggernaut conservative interest groups, American Crossroads and Crossroads GPS, raised $49 million in the first quarter of the year, according to a spokesman for the groups.

Mitt Romney’s presidential campaign announced that he raised $12.6 million in March, meaning his total for the quarter, $31.2 million, is less than that of the groups, which were founded with support of former Bush administration political adviser Karl Rove.

The Crossroads groups also appear to have outraised the Republican National Committee, which brought in $21 million in January and February but has not posted its March totals.

Both Crossroads groups can accept donations of any size from individuals and corporations, and they have both accepted multimillion-dollar contributions for the November elections.

American Crossroads, a super PAC, must disclose its donors names and occupations, while Crossroads GPS, a nonprofit, does not disclose the sources of its funds.

The figures show that the secretive Crossroads GPS has been the preferred vehicle for donors, having already run $10 million worth of ads attacking President Obama and his policies, according to ad-tracking firm Kantar Media/CMAG. The group didn’t report how much money it had left.

The Obama campaign and the Democratic National Committee raised $53 million in March and about $127 million for the entire first quarter.