Don't you hate it when old Navy guys just can't get along? John McCain took a swipe at Jimmy Carter the other day in an interview, with the transcript getting posted over at the Las Vegas Sun earlier today. As the folks at CNN's Politicker point out, it's not just a gratuitous political shot, since McCain has been trying to tie Obama to Carter, generally considered by the right (and quite a few centrists) to have been an ineffectual president. But the comments are a bit jarring. McCain was asked by interviewer Jon Ralston, a Nevada political observer and blogger,...