Republican presidential candidate Mitt Romney arrives in a motorcade at the gated community of Shady Canyon in Irvine, Calif., in March 2012, to attend a fundraiser at the home of Michelle and David Horowitz. (AP Photo/The Orange County Register, H. Lorren Au Jr.))

Why aren't more conservatives donating to Mitt Romney?

Mitt Romney raised $40 million last month. But an analysis of Romney's fundraising shows that many wealthy conservatives, who backed rivals Rick Santorum and Newt Gingrich, aren't donating to Romney's campaign.

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