I'm a lifelong Republican - a supply-side conservative. I worked in the Reagan White House. I was the chief economist at the U.S. Chamber of Commerce for five years. In 1994, I helped write the Republican Contract with America. I served on Bob Dole's presidential campaign team and was chief economist for Jack Kemp's Empower America. This November, I'm voting for Barack Obama. When I first made this decision, many colleagues were shocked. How could I support a candidate with a domestic policy platform that's antithetical to almost everything I believe in? The answer is simple: Unjustified war and unconstitutional...