Now that the Democrats are behind, it's their turn to whine about bad polling.
I don't think polls undercount Democrats in midterms. Aren't the results in midterms much more Republican than the polls predicted? I know that in 2010 they were way off. The GOP won some seats that weren't even close in the polls (for instance, the seat in Duluth and Boucher's seat in Virginia).
Last time, it was the republicans saying even in the final days they'd defy the odds and win the presidency (in a landslide) and the senate. Instead, the democrats swept everything. Now, it's the democrats saying they'll defy the odds and hold the senate (and depending on who you talk to, have house net pickups and make significant net pickups among the governors (>3)). Seems like we're going to see a very good night for republicans.
False equivalency, guys. Unlike the Republicans' claims in 2012:
1) there is actually a trend in polling that backs up this for Democrats
2) several
real pollsters are actually expressing agreement with the sentiment
But I wasn't necessarily saying that this would make the difference in Senate control. If we had a 2010-like discrepancy, however, then it likely would.