Robert Novak Dies at 78

(AP)

CNN and the Chicago Sun-Times are reporting that conservative columnist Robert Novak has died.

Novak was a longtime columnist with the Sun-Times and was also famous for hosting CNN's "Crossfire" for many years. He was also known for first exposing CIA agent Valerie Plame's name in a 2003 column.

Novak was diagnosed with brain cancer last year. He was 78.