What does change mean?

"Incidentally, this is what Democrats mean by change: the ideas of Jimmy Carter, Ted Kennedy, and Dennis Kucinich being mouthed by a young, black man instead of an old, white man. It's sort of like the Democratic idea of diversity, which encompasses a white man, a white woman, and a black man espousing the exact same liberal ideas."

This is a line from John Hawkins blog at Townhall.com