"The Meta-Analysis, a snapshot of todays conditions, has taken a remarkably sharp and large downtick for President Obama. This comes with a massive polling release from three Republican-leaning pollsters: Rasmussen, Gravis, and We Ask America. Just think what are the odds that they would all come out of the gate so fast and all at once? Its almost like they planned it. I guess the true size of the change will get sorted out over the next 1-2 days.
The InTrade price for President Obamas re-election has also dropped sharply. However, our long-term prediction is basically unchanged (see the red strike zone below).
Kevin Drum at Mother Jones asked me to come up with a set of November predictions by today. The midst of a political storm is an unusual time to ask about where well land on shore. But OK, here is where things stand today.
First, a little homily.Without an expression of uncertainty,
predictions are parlor tricks. It is not enough to express a win
probability. Always ask prognosticators what their
uncertainties and/or confidence intervals are. Such numbers can give a very clear view of how strongly to weight the prediction.
The November predictions below come with 1-sigma confidence intervals; approximately two-thirds of the time (68% to be exact), the outcome should be within this range. All calculations are done according to the most recently discussed methods, which are linked.
President: Obama 332 EV, Romney 206 EV. The 1-sigma range (68% of outcomes) is Obama 314-347 EV. The 2-sigma (95%) range is 282-347 EV (95%).
Two-candidate vote share: Obama 52.1+/-0.8%, Romney 47.9 +/-0.8%.
Senate: 54 D/I, 46 R. The 1-sigma confidence interval is 53-55 D/I; 2-sigma, 51-56 D/I.
House predictions are coming soon. I am double-checking a few things. As you know, its a more difficult prediction to make."
http://election.princeton.edu/2012/10/05/predictions-october-5th-presidentsenate/