Rep. Bill Shuster (R-Pa.) has won his primary, beating back two conservative challengers.
Shuster, the powerful chairman of the House Transportation Committee, won the race after working hard to shore up his right flank.
Halvorson had the backing of the conservative Madison Project, but big-spending national conservative groups didn't invest much in defeating the chairman.
Establishment Democrats also got their preferred candidate to face Rep. Mike Fitzpatrick (R-Pa.), as Army veteran Kevin Strouse (D) edged businesswoman Shaughnessy Naughton (D).
-- This post was updated at 12:20 a.m.