While serious discussion of immigration policy reform has been generally avoided for the past year, the politics of immigration have weaved their way through the health care debate as a pet topic on the right, spurring some of the most heated exchanges in blog comment threads, at town hall meetings and, of course, in a joint session of Congress in September, when South Carolina Congressman Joe Wilson broke U.S. House decorum by shouting out "you lie" and waving a finger at President Obama for denying that national health care legislation would provide free coverage for illegal immigrants.