As we watched Sarah Palin on TV the last couple of days, we kept wondering what on earth John McCain was thinking. If he seriously thought this first-term governor — with less than two years in office — was qualified to be president, if necessary, at such a dangerous time, it raises profound questions about his judgment. If the choice was, as we suspect, a tactical move, then it was shockingly irresponsible. It was bad enough that Ms. Palin’s performance in the first televised interviews she has done since she joined the Republican ticket was so visibly scripted and lacking...