Harsanyi makes good point, but I disagree that Republicans have already lost the fight. They never wanted to cut spending in the first place.
When less than 30% of the 2010 Republican Tea Party class in Congress can't vote to eliminate corporate welfare in the form of the Dept. of Energy "green investment" program that's given us Solyndra, Abound Solar, and many other failures, one can only conclude they like the spending. And that their rhetoric of fiscal conservatism doesn't match their votes. Thus, they never really wanted to cut the spending.