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Indiana Rep. Luke Messer Running for Senate
GOP primary candidates have already been sparring

Indiana Rep. Luke Messer announced he’s running for Senate on Wednesday. (Bill Clark/CQ Roll Call File Photo)

Updated 3:30 p.m. | Indiana Rep. Luke Messer announced on Wednesday he’s running for Senate.

In declaring his bid to challenge vulnerable Democratic incumbent Joe Donnelly, the third-term Republican congressman tweeted, “We’re in!!” with a link to his new campaign site just before noon.