My conclusion comes after reading the candidates' memoirs and campaign platforms, attending both party conventions, interviewing both men multiple times, and watching all primary and general-election debates.

John McCain is an honorable man who has served his country well. But he will not get my vote. For the first time since registering as a Republican 28 years ago, I'm voting for a Democrat for president. I may have been an appointee in the George H.W. Bush administration, and master of...