Its not unusual for the poor/working class in the U.S. to vote against their interest, that is the ultimate success of the republican party and specifically Nixon's southern strategy: ensure the white vote by making blacks especially the enemy.  What was particularly stunning was during the 'debates' about the ACA, there were people out there protesting not just against big government intruding on them by trying to give them healthcare they didn't want but yelling at BO to keep his hands of their medicaid - completely unaware that it was a government run program.