Public Policy Polling appears to be likely to release a poll tonight showing Massachusetts neck-and-neck.

The electorate is becoming more Democratic. Last weekend we found it at Obama +16 and now we see it at Obama +20. So all the efforts to get the party base more engaged in the election are paying off. Balancing that out to some extent though is that we’re now seeing Brown win about 19% of the Obama vote, in comparison to 15% on our poll last week.

This line is intriguing:

Even though the race is too close to call overall, 58% of voters think Brown has made a strong case for why he should be elected while only 41% say the same of Coakley.