The grave question the Constitution tasks senators to answer is whether the president committed an act so extreme and egregious that it rises to the level of a high crime and misdemeanor. Yes, he did.
Mitt Romney via the New York Times
…but even Mitt Romney thought it was okay for the president to stonewall the House of Representatives in their desire to investigate the president. Again I ask, who would have thought this way if Obama had stonewalled all eight (yes, eight) of the Benghazi hearings? Almost no one.
