(CNN) - Investigators spent Monday trying to figure out what led 40-year-old Wade Michael Page from repairing missiles for the Army to a Sikh temple in suburban Milwaukee, where he was killed by police at the end of a Sunday morning rampage.
The shaven-headed Page, whose tattoos included the Celtic cross adopted by white supremacist groups, had been the front man for a white-power rock band called "End Apathy" for several years.
On Starting Point this morning, Southern Poverty Law Center senior fellow Mark Potok discusses the prevalence of white supremacist groups and explains how this type of music is used as a recruitment tool.
"I think directly as a result of Obama's election and what that represents, we've just seen an explosive growth not only in white supremacist groups but in anti-government groups, militias, all kinds of groups on the radical right," Potok explains. "It's really been quite frightening."
Explaining that it is difficult to identify individuals involved in the white supremacist movement who may become violent, Potok says, "The sad truth is there are so many of these people that you simply can't put authorities running after each one of them because in most cases, they haven't done anything illegal."