For the second election cycle in a row, U.S. Sen. Ed Markey will face a challenge from a younger Democrat in the state's Congressional delegation.

Congressman Seth Moulton of Salem announced Wednesday morning that he will run for U.S. Senate next year, arguing that Massachusetts cannot wait another six years to install someone from a younger generation in the Senate. The Democrat has not been shy about challenging members of his own party -- he won his seat in the U.S. House in 2014 by defeating longtime Democratic Congressman John Tierney, briefly challenged U.S. Rep. Nancy Pelosi for the speaker's gavel in 2018 and joined a crowded field for president in 2019.

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