Supporters of Senator Barack Obama have suggested Senator Hillary Clinton bow out of the presidential nominating race if she doesn’t win in two big-state primary contests on Tuesday. Influential Democrats have said they need to put together a unifying campaign for the presidential election in November. Texas, Ohio, Rhode Island and Vermont hold primary contests on Tuesday, and Clinton, having lost 11 straight contests, needs to win either Texas or Ohio. Clinton, will have to dramatically exceed the results predicted by polls, which now show Texas sentiment as virtually even. Ohio voters tend to narrowly favour Clinton. In the smaller...