The League of Conservation Voters (LCV) has published a comparison of the energy policy positions of the 2008 presidential candidates, which range from environmentally responsible to business-as-usual.
Of the major candidates, Hilary Clinton, John Edwards and Barack Obama have strong energy policy positions while John McCain has a much weaker policy. Mitt Romney has a very weak positions on energy policy. Of the major candidates only Rudy Giuliani has not articulated an energy policy, except that he supports liquid coal, according to the LCV.
Study the League of of Conservation Voters chart on where candidates stand on energy policy and form you own opinion on who most conforms to your way of thinking.