He seems to be. There are a few articles that talk about Caldwell’s vulnerability. The Landry challenge is for real; Vitter’s endorsed him and I’m already hearing radio ads on Rush and Sean Hannity’s shows.
https://www.businessreport.com/article/left-letting-the-right-prosecute-caldwell
http://jeffsadow.blogspot.com/2015/02/landry-sizzling-caldwell-fizzling.html
http://www.nola.com/politics/index.ssf/2015/06/steve_scalise_chooses_jeff_lan.html
My concern for Louisiana remains that the jungle primary is more of a nightmare for Conservatives when you end up having a Conservative and a RINO in the runoff. Democrats and the RINO party establishment back the RINO and the Conservative often loses. They really need to change it to actual closed primaries and a face-off against the Democrats, which is the only way to ensure better nominees and winners.