Senator Barack Obama emerged from Tuesday’s primaries leading Senator Hillary Rodham Clinton by more than 100 delegates, a small but significant advantage that Democrats said would be difficult for Mrs. Clinton to make up in the remaining contests in the presidential nomination battle. Neither candidate is expected to win the 2,025 pledged delegates needed to claim the nomination by the time the voting ends in June. But Mr. Obama’s campaign began making a case in earnest on Wednesday that if he maintained his edge in delegates won in primaries and caucuses, he would have the strongest claim to the backing of the 796 elected Democrats and party leaders known as superdelegates who are free to vote as they choose and who now stand to determine the outcome… Read More >>