Mr. Obama is now the prohibitive favorite. Tuesday night, he took at least 94 delegates to Mrs. Clinton’s 75 and leads the former First Lady by 176 delegates in the AP tabulation. He has 1,840 of the 2,025 delegates needed to win. Mr. Obama needs only 185 – or 38% – of the 486 outstanding delegates (217 to be elected in the six remaining contests, and 269 superdelegates yet to endorse a candidate). Mrs. Clinton needs 341, or 70% of those left to be awarded.