U.S. Senator Ed Markey of Massachusetts won renomination on Tuesday, according to U.S. media, as Democratic voters favored the 80-year-old progressive over 47-year-old Seth Moulton, a moderate U.S. representative who ran on generational change. "We are not backing down in Massachusetts, not now, not ever," Sen. Ed Markey (D-MA) told a crowd of supporters as he declared victory in the state's Democratic U.S. Senate primary election.

U.S. Sen. Ed Markey faces a competitive Democratic primary challenge in Massachusetts on Tuesday from U.S. Rep. Seth Moulton in his bid for a third full term.

Markey is 80 years old and has been in Congress longer than his opponent, Rep. Seth Moulton (D-MA), has been alive.

The Democrat will be 86 years old when his term ends in 2032.

The contest was among the bitter Democratic feuds this cycle, but bucked the growing trend of younger insurgents ousting older incumbents.