The story

Whether Sen. Hillary Clinton can begin to unite Democrats behind their presumed nominee may be crucial to the party's success in the fall.

Clinton is expected to throw her support behind Sen. Barack Obama's presidential campaign during an event at noon ET Saturday at the National Building Museum in Washington.

A CNN poll released Friday shows that the party is divided after a primary season that stretched over nearly 18 months and 57 contests. Read full article »

All About Hillary Clinton • Barack Obama • John McCain