ABC’s “This Week”:
Sens. Jim Webb, D-Va., and John Cornyn, R-Texas; former Treasury Secretary Lawrence Summers.

CBS- “Face the Nation”:
Former Sen. John Edwards, D-N.C., and his wife, Elizabeth.

NBC’s “Meet the Press”:
Sen. John Warner, R-Va.; cyclist Lance Armstrong.

CNN’s “Late Edition”:
Former Iraqi Prime Minister Ayad Allawi; New Mexico Gov. Bill Richardson; Sen. Sam Brownback, R-Kan.; Lt. Gen. Raymond Odierno, the No. 2 U.S. military commander in Iraq; former Sen. Max Cleland, D-Ga.

“Fox News Sunday”:
Sens. Mitch McConnell, R-Ky., and Jack Reed, D-R.I.; former Arkansas Gov. Mike Huckabee.