Based upon History, when the Liberals push too hard, it creates a push back and the electorate elects people more inclined to pursue the agendas of the right, the Election of 1994 being a good example.
The 2006 Election wasn't the equivilent of the '94 election, but a turnover of congressional power created by the media and the left's bashing of Dubya for 6 years . .
HOWEVER . . . The swing of the pendulum may be countered or not allowed to happen because of "Romney's 47%" which is continuing to grow, and will make great gains if the Democrats and Obozo are allowed to implement their "Amnesty" plans in the upcoming "Immigration Bill" . . Once the Democrats have assured themselves of 51% of the vote by giving the welfare class more "Stuff", we will then have the situation Dinesh D'Souza speaks of in his analogy of the Cart and whos pulling and who's riding. We will have reached the point where there's more people riding than pulling . . that doesn't work for too long.
Problem being, because of several things, the Constitution being the primary one, the Americans aren't like the European or the Asian. Those people have lived under Dictators, Monarchies and Socialist/Communist states and are relatively passive, similar to sheep, seemingly. Not so much with the White Christian American. Their "Push Back" of the Pendulum might involve more than a Ballot Box!
And I think the Left is really afraid of that . . and might be taking steps to prevent it!