I think Conor Friedersdorf has it exactly right when he argues that conservative media failed conservatives:
Conservatives were at a disadvantage because Romney supporters like Jennifer Rubin and Hugh Hewitt saw it as their duty to spin constantly for their favored candidate rather than being frank about his strengths and weaknesses. What conservative Washington Post readers got, when they traded in Dave Weigel for Rubin, was a lot more hackery and a lot less informed about the presidential election.Conservatives were at an information disadvantage because so many right-leaning outlets wasted time on stories the rest of America dismissed as nonsense. WorldNetDaily brought you birtherism. Forbes brought you Kenyan anti-colonialism. National Review obsessed about an imaginary rejection of American exceptionalism, misrepresenting an Obama quote in the process, and Andy McCarthy was interviewed widely about his theory that Obama, aka the Drone Warrior in Chief, allied himself with our Islamist enemies in a "Grand Jihad" against America. Seriously?Conservatives were at a disadvantage because their information elites pandered in the most cynical, self-defeating ways, treating would-be candidates like Sarah Palin and Herman Cain as if they were plausible presidents rather than national jokes who'd lose worse than George McGovern.