What did Christie know, when did he know it?

There are legitimate reasons why we voters have been a lot more willing to trust the tough job of president to governors -- 11 separate times, with Franklin Roosevelt, Ronald Reagan, Bill Clinton, Jimmy Carter and George W. Bush -- rather than senators, which occurred only once in the 88 years between 1920 and 2008 with John F. Kennedy.

Like mayors, governors actually do something. We hold them accountable for the decisions they make about how to spend taxpayer money. They decide through whose neighborhood the new highway will run, and whether to build a state hospital or community college.

Se...