Fred Dalton Thompson, the onetime Tennessee senator who plays district attorney Arthur Branch on NBC's Law & Order, said on Sunday that he is going to "leave the door open" in the coming months as he considers a possible presidential run. "I'm going to wait and see what happens," the Associated Press quotes Thompson as saying. "I want to see what my [GOP] colleagues on the campaign trail say, what they emphasize, whether they can carry the ball next November." Among the big issues for Thompson: Southerlyn v. Rubirosa.