The YouGov poll was also a UMass poll.
I'd say that this race is somewhere between Tilt and Lean D right now, all things considered, but who knows what might change.
It was done in coordination with YouGov, so forgive me for being doubtful. Brown would have needed an oops moment to drop 8 points in a month, and as Sabato said today both candidates are running largely flawless campaigns.
It might just have to do with the relative number of undecideds this far out. Plus, it's Massachusetts. If both candidates run flawless campaigns then all else being equal things tend to break for the Democrat. Brown's incumbency advantage is why I'm saying this is really only Tilt D or so at this stage. We're a long way off yet.
I'm not sure my university even does polls out of coordination with other groups anyway.