Political Animal's Neil Sinhababu spotlights Nick Beaudrot's Cogitamus posts featuring demographic analysis for assessing Obama's perfomance in key GOP-held districts and Dems' chances for winning those districts in November, both open seats and those with incumbents running. Beaudrot has confidence in Obama's coattails and sees more than two dozen Dem pick-ups as a good bet. As Sinhababu explains of Beaudrot's methodology:

The thinking is that demographics predict Obama's performance...and Obama's performance serves as a rough proxy for how Democrats will do this time around. It's a neat way to identify races that may become unexpectedly competitive with Obama at the top of the ticket.

So if you're represented by a Republican in the House, take a look at the spreadsheets (embedded into the page by the magic of Google Docs) and take a look at how the demographics project Obama's performance, and how winnable your district is. We've won three straight special elections in places where Democrats don't usually win, so it's a good year to go after the local GOP congressman.

A lot of assumptions undergird Beaudrot's model, but they are not out of line with recent polls. This could be a helpful tool for DNC/DCCC resources allocation.