Rep. Ayanna Pressley (D-Mass.) said Tuesday she will not launch a primary challenge to Sen. Ed Markey (D-Mass.) and will instead run next year for reelection to her U.S. House seat.

Why it matters: Markey, 79, has faced pressure to step aside amid a growing generational revolt in the Democratic party, with Rep. Seth Moulton (D-Mass.), 47, already running to unseat him. • Unlike Pressley, 51, a high-profile member of the progressive "Squad," Moulton is known as a centrist. • Pressley's decision will likely make it easier for Markey to consolidate the state's substantial progressive voting bloc.

What they're saying: "Hearing from so many people from throughout our Commonwealth encouraging me to run for the United States Senate was deeply humbling," Pressley said in a statement. • She

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