Hillary Clinton refuses to die. Having been given up for dead after losing Iowa, she rebounded in New Hampshire. Then a string of 11 straight consecutive losses - followed by a win in Ohio and a tie (in delegates) in Texas. Now, she's won Pennsylvania. Problem is, it doesn't mean anything. Because of the Democratic Party's arcane proportional-representation rules, her win stands to give her a net gain of 10 to 15 delegates when all is counted. That means that Barack Obama will fall from a lead of 161 in elected delegates to about 145 or so. Big deal. The...