Could Democrats retake the House of Representatives? According to the Princeton Election Consortium, the chances of that happening are now more likely that not if you compare current data to previous elections.
Conditions through August showed a 2% lead on the generic Congressional ballot for Democrats. As of September 20th, in the wake of the Democratic convention, the lead has widened to 4.0 +/- 2.0%. Although it has yet to be appreciated by pundits, this could well translate to a November loss of the House of Representatives by Republicans. Based on the generic Congressional ballot, the probability of a Democratic takeover is 74% with a median 16-seat majority. Whichever party is in control, the seat margin is headed for being narrower than the current Congress. Like any probability in the 20-80% range, this is a knife-edge situation, and the picture may well change over the coming six weeks as more information, especially district-level polls, becomes available. [...]
Where things could go in the next seven weeks. Assume a +/-4% opinion shift between now and November, and this leads to a popular vote prediction of D+0% to D+8%. This gives a Democratic takeover probability of 74%, approximately three out of four.
It's far too early to pop the champagne bottles, and a lot can change in seven weeks, but it is within the realm of possibility that Nancy Pelosi could become Speaker of the House again.
Perhaps after the election is over we can all thank Mitt Romney with a nice fruit basket or membership for the Jelly of the Month Club.