In a play on his famous movie, director Spike Lee urged black voters in South Carolina to "Do the Right Thing" and throw their support behind Bernie Sanders in Saturday’s Democratic primary.

“Wake up! Wake up, South Carolina!” Lee says in the new 1-minute radio ad. “This is your dude, Spike Lee. And you know that I know that you know that the system is rigged! And for too long we’ve given our votes to corporate puppets. Sold the okie doke. Ninety-nine percent of Americans were hurt by the Great Recession of 2008, and many are still recovering."

Lee says those are reasons why he’s “officially endorsing my brother, Bernie Sanders.”

“Bernie takes no money from corporations. Nada. Which means he’s not on the tape and, when Bernie gets into the White House, he will do the right thing!” Lee said, referencing his movie.

Lee also tells voters to note Sanders’ participation in Martin Luther King Jr.’s March on Washington in 1963.

“He fought for wealth and education equality throughout his whole career,” Lee said, making a reference to Sanders' arrest in Chicago for protesting segregation in public schools. “No flippin’, no floppin’. Enough talk.”

Last week, Sanders and Clinton squared off in the Nevada Democratic caucus, where Clinton beat out Sanders in her second win toward the Democratic presidential nomination.