WASHINGTON -- Imagining how John McCain, the Navy war hero, would play the role of commander in chief has been easy. Imagining how John McCain, the policy maverick, would lead as chief executive of the U.S. economy has been tougher. In a wide-ranging interview last week, Sen. McCain offered the most-detailed account to date of his thinking on economic issues. (snip) Climate Change Sen. McCain's biggest regulatory effort is likely to come in the field of climate change. Along with independent Connecticut Sen. Joseph Lieberman, who was then a Democrat, Sen. McCain introduced the earliest version of a cap-and-trade system...