Don't Be Intimidated By the Race Hustling Democrats

If Barack Obama really is a post-racial president, then why are so many liberals crying racism at those who criticize the president?
Why can't a White Person be able to voice their objection to a Marxist ideology being shoved down their throats without being called a Racist?
Why doesn't Obama or sotomayor ever suggest they are not Racist. They simply use Alinsky tactics and point out other racists.