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Senator Tom Harkin (D-Iowa) announced last Saturday that he will not seek a 6th term. Harkin is 73 years old. Iowa Democrat
Representative Bruce Braley is thought to be considering a run to replace Harkin. On the Republican side, it appears (as has often been the case recently) that the endorsement could involve a fight between someone viewed as a moderate Republican versus someone who is viewed as a conservative Republican.
Will Republican infighting help the Democrats retain the Harkin seat? Time will tell.