Call him Barack O'Bama - for he's got the luck of the Irish. The very week he faces his toughest obstacle ever - one that may still derail his candidacy - Obama gets a near-game-ending pot of gold. It now appears certain that Hillary Rodham Clinton's efforts to rewrite party rules in a desperate search for a lifeline have failed. Her absurd proposal of counting her "wins" in Michigan and Florida - long after everyone agreed they wouldn't count - has been laughed off the table. And now, it appears, there won't even be any revotes. While revotes are the...