As polls show voters defecting in droves from Democrats, one bastion of support you’d think the party could count on is Hispanics. They turned out in force in 2006 and 2008 to punish Republicans for their shrill rhetoric on illegal immigration, reversing the party’s historic gains among Latinos under George W. Bush. Now the GOP is at it again. Earlier this year Republican Gov. Jan Brewer of Arizona signed into law one of the most draconian immigration measures in the land. Many of the party’s candidates around the country have embraced it and are scrambling to outdo their opponents in anti-illegal-alien bluster. Even Sen. Lindsey Graham, long a moderate Republican voice on the issue, has moved to the right, floating the idea of repealing birthright citizenship for the children of undocumented immigrants.