As a born Louisianan who would love to see Landrieu sent home for good, I presently cannot help you because I live in California (but looking for a way out).
I know Louisiana politics extremely well and I can tell you that Louisiana has not had a credible Republican challenger for the senate for over a century. Why is that?
Maybe because Louisiana Republicans tend to take their advice from the RNC instead of listening to the people in Louisiana. The only viable state-wide Republicans run for governor not the senate.