There was only way to describe Barack Obama's victory over Hillary Clinton and John Edwards in South Carolina: It was a rout. "After four great contests in every corner of this country, we have the most votes, the most delegates, and the most diverse coalition of Americans that we've seen in a long, long time," Obama declared at his victory celebration in Columbia. "There are young and old; rich and poor. They are black and white; Latino and Asian and Native American. They are Democrats from Des Moines and Independents from Concord, and yes, some Republicans from rural Nevada and...