The latest news on Melancon, Charlie
The Louisiana Democrat is challenging David Vitter for his Senate seat.
Republicans think the Constitution is perfect. But they have 41 ways to make it better.
Louisiana's primary will test whether scandals have weakened the incumbent senator.
Vitter survived a 2007 prostitution scandal and faces two little-known Republicans in his primary.
Obama cannot have been helped by fellow Democrat Charlie Melancon (D-La.), who broke down in tears while trying to read a statement.