Summary
The McCain-Palin campaign is airing radio ads in four states claiming that the Obama-Biden ticket "oppose[s] clean coal." That's false:
Obama's energy plan, which he began promoting well over a year ago, calls for investing in "low emissions coal plants" and creating "5 'first-of-a-kind' commercial scale coal-fired plants with carbon capture and sequestration." His position in support of clean coal has been clear.
The ad's claim rests solely on a remark Biden made when questioned while shaking hands on a rope line in Ohio.