Prospects for bipartisanship today, implications for immigration reform

What are the prospects of bipartisan, well, anything, in politics today?  Marc Hetherington, my fellow University of Texas alum, and some other guy Michael Beschloss, talk on the NewsHour about the possibility and hindrances to contemporary bipartisan policy making.

[youtube http://www.youtube.com/watch?v=M7qus2WQDCo?feature=player_embedded] 

So what I gather is that there is no middle anymore on the ideological spectrum and that moderates in both parties have become extinct.  Instead of having true conseverative and moderate wings of the Republican party, now there is the conservative and conservative-er wing.  Given the present intensive polarization of both parties, neither Hetherington nor Beschloss are optimistic about any bipartisanship going on today which does not bode well for any comprehensive or even minimalist immigration reform.

Republicans may be reluctant to pass immigration reform because they do not wish the Presdent to get credit for it, even though the GOP has strong self-survival incentives to do so.  Immigration reform is currently at the stage of articulations of broad principles, both the Senate version and the "agreement" between labor and business are illustrations of this point.  But once abstraction gives way to the nitty gritty details which are inevitable components of any true comprehensive immigration reform bill, I fear that any immigration reform is doomed because of the very polarization Hetherington and Bescholoss talk about here.