Politics

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Retired Gen. Wesley Clark barely pushed to the top of the extremely tight Oklahoma primary Tuesday, securing his first electoral victory and bolstering his drive for the Democratic presidential nomination.

Sen. John Edwards, D-N.C., discusses his campaign's strategy after a Tuesday victory in his native South Carolina -- a state the candidate had said he must win to remain competitive.

The ricin scare drove senators to the House side of the Capitol as police and Marines continued to quarantine unopened mail in Senate offices. Margaret Warner discusses the most recent developments with Time magazine correspondent Elaine Shannon.

Democratic presidential candidate Sen. Joseph Lieberman of Connecticut thanked his fellow candidates and bowed out of the presidential race after poor performances in all of the seven state primaries and caucuses held around the country.