During the 2004 Democratic presidential primaries he endorsed Massachusetts Senator John Kerry. Gantt stated that Kerry was "an American war hero and willing to stick his head out for education". During the 2008 Democratic presidential primaries he endorsed New York Senator Hillary Clinton and served as a delegate for her to the Democratic National Convention. During the 2012 presidential election he supported President Barack Obama, served as a delegate to the Democratic National Convention, and attended the Obama's second inauguration. During the 2016 Democratic presidential primaries he endorsed Hillary Clinton.