Video of Obama and Hillary Squaring off in Selma Alabama

Clinton, Obama rivalry heats up.Democratic rivals Barack Obama and Hillary Rodham Clinton, joined by former President Bill Clinton, descended on a hallowed shrine of the civil rights movement on Sunday (March 4) to court black voters who could help pick the party's 2008 presidential nominee. Jon Decker reports.

Showdown in AlabamaSens. Clinton and Obama compete head to head for the first time down South.
Sens. Clinton and Obama compete head to head for the first time down South.