SurveyUSA (9/30-10/1, likely voters, 9/10-11 in parens):
Al Franken (DFL): 33 (40)
Norm Coleman (R-inc): 43 (41)
Dean Barkley (IP): 19 (14)
(MoE: ±3.7%)
I like SurveyUSA a lot, but their work in Minnesota has been all over the map, often with some weird results for younger voters. This poll is no different; voters aged 18-34 support Coleman by a margin of 44-33-13, that's down from 48-33-14 for Franken earlier in September. Franken isn't having an easy time in this race, yes, but I highly doubt that the kids love Coleman that much.
UPDATE: Major warning bell -- SUSA just released their Presidential numbers for Minnesota (conducted as part of the same poll as the Senate numbers), and McCain is leading by 47-46. That's starkly different from the latest CNN/Time poll showing Obama up by 54-43. I'm pretty suspicious of this poll altogether.