Daily Kos commissioned the following poll from independent pollster Research 2000:
Research 2000 for Daily Kos. 9/10-12. Likely voters. MoE 4% (No trend lines)
For whom did you vote for in the 2006 race for U.S. Senate, Ned Lamont, the Democrat, Alan Schlesinger, the Republican, or Joe Lieberman, an Independent?
Lieberman Lamont Schlesinger
All 49 42 9
Dem 34 62 4
Rep 67 10 23
Ind 53 41 6
If you could vote again for U.S. Senate, would you vote for Ned Lamont, the Democrat, Alan Schlesinger, the Republican, or Joe Lieberman, an Independent?
Lieberman Lamont Schlesinger
All 40 48 10
Dem 25 72 3
Rep 69 7 24
Ind 38 49 9
Lieberman won 50-40-10 in 2006, so the poll tracks closely. But even if you account for a slight Lamont bias, it still looks like buyer's remorse. Full polling memo from R2K below the fold.
Race tracker wiki: CT-Sen
http://www.dailykos.com/storyonly/2007/9/13/124925/928