If the Republican Party ever hopes to return as part of the governing coalition of the United States, they will have to cut ties with the Tea Party. The alliance has hurt them more than it has helped them.
The latest evidence is the surprising primary defeat of House Majority Leader Eric Cantor to a Tea Party challenger, David Brat. The issue: the very conservative Cantor was not conservative enough. The evidence: that he might possibly consider immigration reform.
In the short run, it would certainly be costly to the Republicans to wrest their party back from the cuckoos in the nest. It would likely cost them their majority in the U.S. House of Representatives. However, in the medium run, when they no longer had to worry about being primaried, Republicans could start cooperating with the Democrats again in running the country.