Some things just take awhile to sink in or get packaged in a way that people hear them. Here is the video with the sound clip of Obama talking about coal in San Francisco.
I think the difference between candidates is that Obama wants to impose more stringent regulations sooner (immediately). I think McCain’s view is that in view of the security needs of the nation, we cannot move so quickly and remove another source of energy based solely on environmental concerns. For an industry making a transition, the pace of change is important.