First, they had their shot at holding power, and they failed. They've failed in staying true to their principles of limited government and free markets. They've failed in preventing elected leaders of their party from becoming corrupted by the trappings of power, and they've failed to hold those leaders accountable after the fact. Congressional Republicans failed to rein in the Bush administration's naked bid to vastly expand the power of the presidency (a failure they're going to come to regret should Obama take office in January). They failed to apply due scrutiny and skepticism to the administration's claims before undertaking Congress' most solemn task—sending the nation to war. I could go on.
Libertarians for Obama
"While I'm not thrilled at the prospect of an Obama administration
(especially with a friendly Congress), the Republicans still need to
get their clocks cleaned in two weeks, for a couple of reasons."