Just 13 House districts out of 52 flipped parties, 3 Dem to Rep and 10 Rep to Dem. Rush could have used Al Gore's amazing internet and found the correct information in seconds, but he's too damn lazy and stupid.
Here's Ballotpedia's article on the subject:
A total of 52 representatives did not seek re-election to their U.S. House districts:
18 Democratic members of the U.S. House [10 retired from public office]
34 Republican members of the U.S. House [23 retired from public office]
In total, 13 of the 52 districts changed party hands. Ten seats flipped from Republican to Democrat. Three seats flipped from Democrat to Republican.