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Mourdock needs to catch up in fundraising for Indiana's Senate race: while his opponent, Rep. Joe DonnellyJoseph (Joe) Simon DonnellyKoch-backed group targets red-state Dems on tax reform Dems plan to make gun control an issue in Nevada Agricultural trade demands investment in MAP and FMD 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.