WARREN, MI - JULY 18: General Motors vice chairman Robert A. Lutz (L), GM CEO Rick Wagoner (2nd-L) and GM's Vice President for Energy and Environmental Policy Beth Lowery (R) depart after giving presumptive Republican presidential nominee Sen. John McCain (R-AZ) (2nd-R) a preview of the Chevrolet Volt, GM's new extended-range electric vehicle, while taking a tour of the GM Design Center July 18, 2008 in Warren, Michigan. McCain spoke to the employees at the GM Design Center during a Town Hall meeting about issues regarding energy while also answering questions from a variety of topics.