Here is a map that combines projected 2012 Electoral College and congressional re-apportionment with an even, national swing of 7.16%. It is, in short, a crude attempt to predict swing states in the event of a close 2012 presidential election:
Electoral College 2012, tied popular vote projection
Obama 258, Republican 258, Toss-up 22

Solid Obama (PVI of D +6.0 or greater): 213 Electoral Votes
Lean Obama (PVI of D +2.3 to D +5.9): 45 Electoral Votes
Toss-up (PVI of D +2.2 to R +2.2): 22 Electoral Votes
Lean Republican (PVI of R +2.3 to R +5.9): 47 Electoral Votes
Solid Republican (PVI of R +6.0 or greater): 211 Electoral Votes
This map does not project demographic changes in given states, and assumes an even popular vote. "PVI" refers to "partisan voting index," or the degree to which a given state's popular vote is projected to be different from the national popular vote. The 2.2% toss-up / lean line and the 6.0% lean / solid line were derived from previous polling research, which was reinforced in 2008 (more on that later).
This map forecasts an almost precisely even Electoral College, with Virginia as the ultimate swing state. Whoever would win Virginia's 13 electoral votes would reach 271 electoral votes, thus winning the election no matter what happens in Colorado. Virginia's preliminary Partisan Voting Index is Republican +0.86%, but ongoing demographic changes in the state, particularly in Northern Virginia, probably would render it an even contest by that point.
As already noted, this map is crude, and does not take inevitable fluctuations of demographics, organizing, and candidate appeal into account. Still, if Virginia is the number one swing state in the event of a close 2012 presidential election, the Virginia Governor's campaign in 2009 becomes a lot more interesting. Apropos, this first poll on the campaign was released today. It revealed, unsurprisingly, a very close campaign for the seat to be vacated by Tim Kaine.
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