(We made a fun video about why this is happening. Watch it above!)

While some of the Republicans quitting the House are vying for other positions, such as governor, more than half are leaving politics altogether. They represent a combined loss of almost 400 years of experience in Congress. Add the retirement of senators Jeff Flake (Ariz.), Bob Corker (Tenn.) and Orrin Hatch (Utah), and about 460 years of Republican experience are heading out the door.

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These retirees are not just back-bench Republicans. The party is losing many of its top leaders, most notably House speaker and conservative icon Paul Ryan. Also on the way out: House Judiciary Committee Chairman Bob Goodlatte (Va.), House Financial Services Committee Chairman Jeb Hensarling (Tex.), House Oversight Committee Chairman Trey Gowdy (S.C.), Foreign Affairs Committee Chairman Edward R. Royce (Calif.) and House Appropriations Committee Chairman Rodney Frelinghuysen (N.J.).

Many of them are nearing the end of their chairmanships, so it makes some sense that they want to leave Congress, especially with the looming prospect of the party losing the majority. It’s not fun to be in Congress without power.

But others are going amid a sense of frustration with the direction of the Republican Party, especially Ryan, Flake and Corker. And moderate conservatives, such as Rep. Ileana Ros-Lehtinen (Fla.) and Rep. Charlie Dent (Penn.), are leaving after openly warring with President Trump.

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Coming to fill their seats, at least in districts that Democrats don’t pick up, is a new class of freshman Republicans expected to be more loyal to the Trump brand.

This caps off an extraordinary transformation of the Republican Party from the post-Reagan era to the Trump era. The majority of elected officials who opposed Trump before he became the Republican presidential nominee have gone silent. They’re sticking with their party’s choice, and so is their base.

At the same time, traditional funders of the Republican Party, such as the Koch Foundation, are looking for new political beneficiaries. Trump’s new brand of conservatism doesn’t appeal.