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Mourdock needs to catch up in fundraising for Indiana's Senate race: while his opponent, Rep. Joe DonnellyJoseph (Joe) Simon DonnellyOvernight Finance: Trump signs Dodd-Frank rollback | Snubs key Dems at ceremony | Senate confirms banking regulator | Lawmakers lash out on Trump auto tariffs Trump signs Dodd-Frank rollback Trump doesn't invite key Dems to signing ceremony on their bill MORE (D-Ind.), only had $800,000 in the bank as of mid-April, Mourdock broke the bank to defeat sitting Sen. Dick Lugar (R-Ind.) in last week's GOP primary and ended that race with nearly no cash on hand.

Rubio and Mourdock are both Tea Party favorites. Rubio has also been high on many pundits' shortlist for Mitt Romney's vice presidential pick.