Just about answers that.
Why do you think Republicans have stalled in the Senate polling even though the playing field looks to be expanding in the House?
I guess it is the difference between a "generic" republican and an actual candidate.
A "generic" republican would likely have won Delaware,.. "the Witch" likely will not.
Secondly, the Dem base will, at least in part, come home by election time.
To take Pennsylvania as an example, Mr. Obama won Pennsylvania by about 10 or 11 points as I recall.
Sestek is pretty moderate, and Toomey is a VERY conservative candidate.
The fact Toomey is, in a +11 Dem state, as a VERY conservative candidate, a few points ahead still represents a staggering shift. - What would it say about the nation if a Ted Kennedy Liberal was running competitively for the Dems in say Mississippi?
There are races "on the map" that 1 year ago were "fantasy island" for the GOP - the fact a few of them tighten up as the Dem base comes home is hardly a shock.