Suffolk University is releasing a poll on the Massachusetts US Senate race tomorrow, and I don't think it's a coincidence that the Democratic Senate Campaign Committee (DSCC) just released its own poll, taken May 8-10 of likely voters, showing the race tied, 46%-46%.
The Elizabeth Warren camp tends to think that Suffolk skews to Scott Brown -- they had him ahead 49%-40% in February. You gotta figure that, if the new poll tomorrow is as bad or even worse, the DSCC would almost be forced to go public with this tie-game poll to counter the panic. Better to release it first, which looks more credible now than it would in response to someone else's poll.
That's my theory, anyway. Regardless, the DSCC poll shows a dead heat. They did not release favorable/unfavorable ratings for the candidates.