By Andrew Holleran Former football star turned political candidate Herschel Walker spoke at a rally featuring former United States president Donald Trump on Saturday. Walker, who’s running for Senate in Georgia, made an embarrassing gaffe while speaking at the rally on Saturday. The former college football and NFL star referred to Critical Race Theory as “CTR.” “I’m sick and tired of them wanting to teach CTR in school,” Walker said. “Critical race theory, can you tell me what that means?” Walker, 60, is a Senate hopeful out of Georgia, where he starred playing college football. He was a natio…