Over the weekend, John McCain promised to appoint a high-profile Democrat to his administration. The move is telling. The problem isn’t that McCain would appoint a Democrat, but that it reveals his affinity for bipartisanship for the sake of bipartisanship. There is nothing inherently wrong with bipartisanship, but neither is there anything inherently good: Nobody benefits from political compromise that produces bad policy. Moreover, I wonder if a president who sets out looking for a Democrat (or a woman or a Hispanic or a white male) to fill a particular role in his administration runs the risk of overlooking the best candidate for the job?