I could not find the party breakdown.
Top of page 17.
There’s a lot of internals. Badly organized though.
http://www.commonwealthpoll.vcu.edu/CPOLL-Pres-Sen-Race-report-10-26-08.pdf
289 (D) 250 (R) 320 (I)
so really it is more like:
609 (D) 250 (R)