Dems certainly dont need NH in order to win senate.
No, but with Toomey significantly leading Sestak in PPP surveys, Burr having no clear challenger, Portman having a large collection of attack ads used by Kasich in the 2010 gubernatorial election that he (Portman) can simply (re-)attack Strickland with, and McCain likely to survive his primary, dems shouldn't let NH 'fall by the wayside'.
Toomey leads by four pts in last PPP survey. And 2 QU polls in a row shows Strickland competetive. I think Senate is still a tossup.