Moderate House Republican Charlie Dent won't seek re-election

J. Scott Applewhite / AP

Charlie Dent, a Pennsylvania Republican and one of the few outspoken moderates in the House, announced Thursday that he will retire after 7 terms.

Co-chair of the moderate Tuesday Group, Dent has criticized President Trump on everything from firing James Comey to his response to Charlottesville, and challenged more ideological members in his party on health care and other key issues. That has made him a target within the party, and he already had a conservative primary challenger, per the Morning Call newspaper.

Why it matters: In the current climate, moderates simply aren't being elected to Congress. So as the likes of Dent leave, the House will only become more polarized.