Yet another Colorado poll to add to the heap, this one by Frederick Polls (7/16-22, likely voters):
Mark Udall (D): 48
Bob Schaffer (R): 39
(MoE: ±3.7%)
And now, for the Maine event: Critical Insights (6/1-27, registered voters, 10/17-30 in parens):
Tom Allen (D): 37 (34)
Susan Collins (R-inc): 51 (54)
(MoE: ±4%)
That's pretty much in-line with what we've seen happen in this race over the past year: a slight tightening, but plenty of ground left that Allen has to play catch-up on. This race is tough but doable, and if Democrats can pry this one out of Susan Collins' cold fingers, they'll hold it for a long, long time.
UPDATE: When the Maine poll's sample is narrowed to likely voters, Collins' lead shrinks to 50-40. Check out the polling memo for more details.