Kerry now leads in all the tracking polls, as the Iowa Effect seems to have changed the dynamic of the NH race. He's been gaining at a pretty impressive clip. Dean, on the other hand, is bleeding support, Clark is slowly dropping or stagnant, and Edwards is slowly climbing.
As always, the primary value of tracking polls is trend-measuring -- all of the polls below are capturing the same trends, more or less. The one area of disagreement is on whether Clark has plateaued or continues to lose support.
ARG, Jan 19-21 (18-20), 301-02 likely, +/-6
Kerry 27 (24)
Dean 22 (26)
Clark 19 (18)
Edwards 9 (9)
Lieberman 7 (7)
Suffolk, Jan 20-21 (19-20), 400 likely, +/- 4.9
Kerry 27 (20)
Dean 19 (22)
Clark 15 (15)
Edwards 7 (6)
Lieberman 6 (6)
Zogby, Jan 19-21 (18-20), 600 likely, +/- 4.1
Kerry 27 (23)
Dean 24 (25)
Clark 15 (16)
Edwards 8 (7)
Lieberman 6 (7)
Globe/Doubleyew-Bee-Zee Bos-ton!, Jan 20-21 (19-20), 400 likely +/-5
Kerry 31 (27)
Dean 21 (24)
Clark 16 (17)
Edwards 11 (9)
Lieberman 4 (4)
Given these trends, Dean needs a killer debate tonight. And Clark better impress if he wants to do better than third in the state he's focused on for two months.