GWEN IFILL:

Former presidential candidate John Edwards' surprise endorsement of Barack Obama tonight could change the complexion of the Democratic race, this in spite of Hillary Clinton's big win last night.

Hillary Clinton, fresh from a 41-point victory in West Virginia, spent the day savoring it and reassuring supporters. After beating Barack Obama by a margin of 67 percent to 26 percent, Clinton declared she has no plans to quit before the last primaries are held in June.

SEN. HILLARY CLINTON (D), New York: We know from the Bible that faith can move mountains.

And, my friends, the faith of the Mountain State has moved me.

I am more determined than ever to carry on this campaign…

… until everyone has had a chance to make their voices heard.