Rubio will fundraise for Mourdock in Indiana

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Mourdock needs to catch up in fundraising for Indiana's Senate race: while his opponent, Rep. Joe DonnellyJoe DonnellyOvernight Finance: Senate punts on Zika funding | House panel clears final spending bill | Biz groups press Treasury on tax rules | Obama trade rep confident Pacific deal passes this year Overnight Healthcare: Lawmakers leave for summer without approving new Zika funds Dems block defense spending bill for second time 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.

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