warned voters in Iowa that colleges and universities had become "indoctrination centers for the left."

For his part, President Barack Obama spoke about the importance of college affordability during his annual State of the Union address on Tuesday.

"We can't just keep subsidizing skyrocketing tuition; we'll run out of money," he said. "So let me put colleges and universities on notice: If you can't stop tuition from going up, the funding you get from taxpayers will go down."