Princeton Election Consortium: Republicans at risk of losing the House [View all]

[muriel_volestrangler]

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. This picture may change over the coming six weeks as more information, especially district-level polls, becomes available.

As seen in recent articles in Politico and U.S. News, few pundits think the Democrats will re-take the House. However, analysis of a leading indicator suggests to me that transfer of control is a distinct possibility.

Predicting the House outcome is challenging. First, there is the basic problem that we have to estimate how far opinion will move between now and November. On top of that, there is uncertainty in knowing how the polling measurement – generic Congressional ballot preference – translates to a seat outcome.

Another approach would be to use district-by-district polls and ratings. An estimate like that can be seen from our data partner, Pollster.com. Their House outlook shows retained GOP control, and RealClearPolitics implies the same. However, many of those polls are weeks or months old. My estimate today suggests that in the coming weeks, we might look for district polls to move in the Democrats’ direction. This is also an opportunity for a detailed analytical approach, as taken elsewhere, to shine.

http://election.princeton.edu/2012/09/20/house-outlook-for-2013-take-2/