Well, August has been a long and frustrating month of ‘made-for-media’ controversies and equally irrelevant prognostications on the likely outcomes of the upcoming midterm elections. It would seem, from all the headline-mongering and talk show bloviating, that Democrats are in for a whuppin’ along the lines of 1994 but the polls don’t lie, very often, and things may not be what they seem at first glance.
Are Democrats going to lose seats? Pretty bloody likely. Are they going to lose control of the House and the Senate or both? Hard to say but probably not. Sound counter-intuitive given the current conventional wisdom, such as it is? Lets take a closer look, it’s pretty clear that things have been headed the Republicans’ way recently, no argument. But how much?:
We could obsess further over the consistent differences among pollsters, but what is far more important, is that the averages show a GOP lead that has been trending in the Republican direction all summer. That trend is consistent with the historical pattern identified here on Friday by political scientists Joe Bafumi, Bob Erikson and Chris Wlezien, the “electorate’s tendency in past midterm cycles to gravitate further toward the “out” party over the election year.”Moreover, you see the same trend even if we drop all Newsweek and Gallup polls, plus all of the Internet-based surveys and automated surveys (including Rasmussen), and focus only on the remaining live-interviewer telephone surveys, as in the chart [shown here]. The margin for the Republicans is virtually identical (46.6% to 41.4%).
So while the “unprecedented 10-point lead” reported by Gallup probably exaggerates the Republican lead, any result showing a net Republican advantage on the so-called generic ballot is bad news for Democrats. Bafumi and his colleagues estimated their 50-seat gain for the Republicans assuming a two-point advantage for Republicans on the generic ballot, which they project will widen to a six-point lead by November.
Mark Blumenthal – Gallup vs. Newsweek on the Generic Pollster 30 Aug 10
Fifty seats is a shocker, to be sure, but trends away from the incumbent majority seem to also be unexceptional, historically, in American politics. And since the cited post was written the generic ballot gap has apparently narrowed again slightly to 3%. How determinate is the generic ballot polling to a large number of specific races? And what are the issues affecting polling at this stage for a midterm election in both houses?