The important thing in American politics is what didn’t happen in Mississippi. The Tea Party candidate, Chris McDaniel, did not win. The incumbent, veteran Republican Senator Thad Cochran, did prevail. The natural order held.
This is not to say that the victory of an establishment politician – indeed, a moderate Republican looking for his seventh term in a state that once was reliably Democratic – over a conservative insurgent is the natural order of things. It is merely to say that for the past half century or so, incumbent American congressional figures tend to be re-elected.