The hand-wringing over the Republican presidential field has not abated much since Indiana Gov. Mitch Daniels announced he would not be seeking the GOP nomination, but a new name might soon be entering the fray, Rep. Thaddeus McCotter, the guitar-playing, soul-searching libertarian from Michigan. Mr. McCotter has told Politico he’s seriously considering a run and will make his decision in the next two weeks. Never heard of him? Well, here’s a McCotter primer: His jams on a Fender Telecaster emblazoned with red, white and blue , although he has been known to pick up a Stratocaster as well. The conservative...