yes, the national numbers versus the breakdown numbers for swing states are mostly trivial for occupying the White House ...
but we lack good solid polling on down ticket things (the house and senate). The only decent professional donw-tciket view-point is the performance of the top of the ticket, and that is as relevant in non-swing states as swing states.
If Romney only is expect to win MT by 2 instead of 12 or 22 ... then Tester has a real chance.
Certainly for the most part we have deliberate sampling for the senate ... but for these house seats in "states that are not swing they don't matter" are the ones where a difference between a red +6 and a red +26 makes the difference in house takeover notions and not (not that it is going to happen, but because those states are not swinging much from +26 to +6 ... yet).