08 Oct 08
according to experts.
http://www.nytimes.com/2008/10/05/weekinreview/05schwartz.html?em&exprod=myyahoo
Maverick family members of San Antonio remind that the expression comes from their ancestors' practice of refusing to brand their catttle.
As for McCain, “He’s a Republican,” [Terrellita Maverick] said. “He’s branded.”