Rep. Seth Moulton, D-Mass., announced this morning that he is launching a bid for Senate, challenging Sen. Ed Markey. Moulton's bid marks the first high-profile challenge to Markey, a Democrat who has served in Congress for nearly five decades. "Real people across Massachusetts are being hurt by Democratic leaders refusing to do everything they can to win," he said in his announcement video. "We've got to look in the mirror and be honest: It's time for change." Moulton, 46, in

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