What is the U.S. debt ceiling, where did it come from and why does it matter? This time the familiar Washington ritual has a twist. And investors are starting to anticipate something new: The most critical of deadlines may be missed. How can this happen when the White House and Congress are controlled, nominally, by the same party? Why even have a debt ceiling? Special guests Alex Harris and Brian Chappatta join Dan to explain that this time it actually could be different.