Mickey Kaus is a brilliant political observer, and he suggests the Dems are trying to set up the Republicans to go overboard with their animosity toward Barack Obama. That would ignite the Democrat Party base and motivate those Democrats that might otherwise sit out the midterm elections.
According to this theory Obama spreads some untruth or deliberately and obviously impairs serious investigations into Benghazi, the IRS, or some other scandal, and Republicans take the bait. They blow their stacks and come across as irrationally angry. Democrat and independent voters viewing it all through the MSM lens see Obama as the victim and decide to send Republicans a message at the ballot box: Quit being so mean.
It makes sense. And when we hear talk of impeachment we can sense that it's working. Obama knows how to win elections. It's the only thing he knows how to do, but he does know how to do that.