Today Public Policy Polling puts Republican Chris Christie up over Democratic Gov. Jon Corzine, 44 percent to 35 percent. The trend in this and other polls suggests that Christie’s lead is narrowing a bit, but the phenomenon seems to stem from Christie losing supporters, not Corzine gaining them.

PPP notes: “Just 62 percent of respondents who report having voted for Corzine in 2005 say they plan to do so again, while he’s won over only 4 percent of previous GOP rival Doug Forrester’s voters.”

I’m a little wary of high expectations for third-party candidates; this poll has Christopher Dagget at 12 percent; two polls from earlier in the month put him at 10 percent.