Everyone knows presidents have larger-than-life size egos. It goes with the job. But changes on the official White House website reveal that we've never had a self-regarding narcissist quite like the oval Office's current occupant.

Like all our political institutions, the presidency has evolved with the growth of the nation and the pace of change in the modern world. Three key changes come to mind.

The nation is consumed with economic problems, yet a national security crisis can shift our priorities in a single moment. It's time to find out how the men and women who would be president will perform when that crisis hits.

We are in the midst of the eleventh presidential nominating cycle since party commissions and state laws made primaries the predominant method of choosing national convention delegates in 1972. Over the years politicians and journalists develop rules of thumb to describe how these things work. In this cycle, some of those rules seem to be changing.

Foreign policy and national security will take center stage tonight as Republican presidential hopefuls tackle questions from American Enterprise Institute and Heritage Foundation scholars live on CNN.

Sen. Jim DeMint doesn’t think people much care about his presidential endorsement. But people do care--a lot.