BOSTON (AP) — U.S. Rep. , a moderate Massachusetts Democrat, said Wednesday that he will challenge U.S. Sen. for the Democratic nomination in next year’s Senate race, arguing it's time for the party to embrace a new generation of leadership.

The announcement makes the race one of the most anticipated primary contests in the country and pits two of the heavily Democratic state’s top politicians against one another. Markey, who from Rep. Joe Kennedy III in the Senate primary, would be 80 before his third six-year term would begin.

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