With the GOP ruling the House if the economy changes little or not at all how can they claim any effectiveness?

The GOP got the House now, if the economy improves even off efforts mad by the DNC before the elections will the GOP get credit for it I know they will try ? Now that they have the House and said they are taking back government for the people if the economy doesn’t improve or improve more rapidly how will they play their seemingly ineffectiveness? Because if them having the House does little or nothing to change the course of the economy how can they say they helped? And if they filibuster and sandbag everything causing the economy to worsen isn’t that shooting themselves in the foot for 2012? To look good in 2012 don’t they have to bite their tongue and ”play nice” so any further flop won’t look like they spurred it on?