Is Fred foundering?

Chris Cillezza of the Washington Post blogs that Fred Thompson is foundering in the polls. He cites national polls and some state ones. In North Carolina, Thompson is definitely headed in a downward direction. Thompson's support in North Carolina has fallen in nearly every month.

25% May
37% June
34% July
30% August
34% September (campaign kickoff)
31% October
24% November

Now he leads Giuliani by only 5%. According to Survey USA he is already losing to Rudy in the Tarheel State. Thompson's national poll numbers have always been buoyed by a strong showing in the southeast. If his southern supports dips then he won't be able to stay in second in the national polls.