Katie Couric's Notebook: John McCain

John McCain is talking about climate change, in part to signal to voters that he's a different kind of Republican than President Bush.

At a time when polls say that more than 80 percent of the country believes we're on the wrong track - and a record number disapproves of the president's job performance - McCain can't run a campaign that offers more of the same.

For more from my Notebook, click the monitor.