Political Wire says that former Virginia governor Mark Warner (D) is being courted to run against incumbent John Warner (R-VA), and is seriously considering it.
Actually the two ran against each other in 1996. But Mark Warner was much less well-known then. He left office in 2005 with sky-high popularity ratings. Meanwhile, John Warner's growing independence on defense and national-security may have weakened his hold on some conservatives, and he just turned 80.