The question of any analysis lies in - what does your model say, and how valid is it?
Inspect and run it yourself is always a bottom line answer.
Here's one such (note sources for both R and STATA, if you browse the site):
This via a recent reference by Joshua Holland on BillMoyers.com -
I had imagined a site like this, only with some correlation to the purpose and benefactors of any particular bill (which would be easier if they were single topic items, of course). In any case, for all you "data" fans, here it is.
There are a few parts of this which I find interesting:
- The Polarization of the Parties
The polarization diagram is best viewed in the context of this page, but since there are no tags to internally link to the various sections, I pulled out the image separately as a way to point to it.
- The analysis and software available (R and STATA, for the most part):
- The blog with recent analysis (and predictions, as is the case currently):
Be sure to play with your own analysis - R-Studio (http://www.rstudio.com/) or IPython Notebooks, with the "R magic" extension should do it (http://bit.ly/19o4Biv and http://blog.fperez.org/2012/