Story highlights Midterm elections are historically tough for the party of the President in power

Here's who has announced they plan to retire or run for another office

Washington (CNN) This fall has seen a steady stream of Republican House members announcing their plans to resign, retire or run for another office.

As moderate Republican members Dave Reichert and Charlie Dent prepare to leave Congress , conservatives want stronger allies in their seats, while Democrats see an opportunity to flip them.

Democrats need to pick up 24 seats to retake the majority from Republicans, who've maintained control of the House since 2011.

The campaign committees on both sides are eying the 23 Republicans defending districts that Hillary Clinton won, and the 12 held by Democrats in districts that President Donald Trump won as vulnerable seats to flip.

While midterm elections are historically tough for the party of the President in power, it's too early to tell how things will unfold next year.

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