[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/08/25/art.four.gi.jpg caption="The Democratic speakers tonight are more liberal than mainstream America, Castellanos says."]Senator Kennedy's speech is going to be one of the highlights of the evening if not the entire Democratic Convention.
But it also demonstrates one of the challenges facing Barack Obama.
Tonight, America is hearing from the national Democratic Party - House Speaker Nancy Pelosi, former President Jimmy Carter, Rep. Jesse Jackson Jr, Ted Kennedy, a group considerably farther left of center than mainstream America.
They are not change. They are classic, old school "make Washington bigger" Democrats.
When Obama won the nomination, change ran into the national liberal Democratic establishment. So far, as we can see tonight, the national Democratic Party has won.
Let's see if the Obama campaign chooses to reverse that and regain the mantle of change this week.