First and foremost, the Republican brand as effective stewards of the taxpayer dollar is in tatters, and the shredding doesn't look to stop any time soon. Just last week, 138 House Republicans joined the Democrats in voting to override the president's veto of a wasteful and pork-ridden Water Resources bill. That vote was a shameful display of personal politics over the national interest, and it contains the seeds of destruction of whatever conservative principles remain in the Republican party.
The callow accommodation to big-spending Democrats in Congress is one of the ways the Republican party will return itself to the days of serving as a compliant, permanent minority. Happy for table scraps, elected Republicans will simply abandon the ideas of their party in order to "get along".
No wonder Americans prefer Democrats on the economy, taxes, and spending issues, according to recent polling data. When the choice is between Democrats, and the Democrat-lite ideas the GOP has become so comfortable offering, the Democrats will win every time.