Yes, yes, yes, it's much too early to start thinking about running mates. Too bad. People are doing it anyway. And even though they won't admit it, odds are that Sens. John McCain, Barack Obama and Hillary Rodham Clinton are giving it at least some thought. So, too, are people who turn up their noses at the suggestion they might be a good fit, yet secretly harbor ambitions of getting the nod. Veepstakes speculation - always an undercurrent with a presidential election afoot - intensified this past week after Mitt Romney dropped out of the race, helping to clear McCain's...