I think it's fair to say that Protect IP is now a Democratic bill with a few Republicans along for the ride. The ratio is over 3:1 now, by my count. (See below.)

Why does this matter? Because the more partisan the legislation is perceived as becoming, the more likely it is to blow up in the face of the MPAA, RIAA, and their allies. The *AA's strategy all along has been to claim (until this week, with some justification) that this legislation is "bipartisan." There's a reason that gently reassuring phrase appears 113 times on MPAA.org:
http://is.gd/ZWCeKI

22 Democratic supporters of Protect IP:
* Bingaman, Jeff - (D - NM) 2012
* Boxer, Barbara - (D - CA)
* Brown, Sherrod - (D - OH) 2012
* Casey, Robert P., Jr. - (D - PA) 2012
* Coons, Christopher A. - (D - DE)
* Durbin, Richard J. - (D - IL)
* Feinstein, Dianne - (D - CA) 2012
* Franken, Al - (D - MN)
* Gillibrand, Kirsten E. - (D - NY) 2012
* Hagan, Kay R. - (D - NC)
* Johnson, Tim - (D - SD)
* Klobuchar, Amy - (D - MN) 2012
* Kohl, Herb - (D - WI) 2012
* Landrieu, Mary L. - (D - LA)
* Leahy, Patrick J. - (D - VT)
* Lieberman, Joseph I. - (ID - CT) 2012
* Menendez, Robert - (D - NJ) 2012
* Nelson, Bill - (D - FL) 2012
* Schumer, Charles E. - (D - NY)
* Shaheen, Jeanne - (D - NH)
* Udall, Tom - (D - NM)
* Whitehouse, Sheldon - (D - RI) 2012

7 Republican supporters:
* Alexander, Lamar - (R - TN)
* Cochran, Thad - (R - MS)
* Corker, Bob - (R - TN) 2012
* Enzi, Michael B. - (R - WY)
* Graham, Lindsey - (R - SC)
* Isakson, Johnny - (R - GA)
* McCain, John - (R - AZ)

Note that supporters != sponsors. Some sponsors listed on Congress' own web site are no longer supporters. If I've missed anyone, please let me know.

This is, by the way, based on my own conversations with dozens of Senate aides in the last 48 hours and the good folks at OpenCongress.org who have done their own crowdsourced whip count:
http://www.opencongress.org/wiki/Protect_IP_Act_Senate_whip_count

And if I'm right in my micro-analysis above, it implies that opponents of Protect IP/SOPA should concentrate their fire on the seven remaining GOP supporters before next Tuesday's vote. (After all, if even former Judiciary chairman Orrin Hatch wants out, why are his colleagues still on the bus?) So far, Republican senators have been much more eager to back away from the bill than Democrats.
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