More incumbents are now likely to face primaries, including Sen. Roger Wicker of Mississippi, making it vastly more expensive to preserve the majority.

Sen. Bob Corker of Tennessee, chairman of the Senate Foreign Relations Committee, yesterday announced his retirement in “another blow to the Republican establishment” that will likely touch off “a highly contested, ideologically driven primary,” per the WashPost.

Health care repeal died again yesterday, this time without a vote. (N.Y. Times lead headline: “REPUBLICANS DROP MEASURE TO UNDO HEALTH CARE LAW.”)