IMHO, Cassidy is a well concealed RINO. If he were the only opponent to ML, I would hold my nose while casting my vote for him. My choice is Manness, the teal party choice at this time and also of Michael Berry, who hates Landrieu.
I don’t think Maness holds up very well in a one-on-one race against Landrieu. He’s only lived in Louisiana a few years and still owqns a (subsidized) farming operation in Indiana. It would be hard for him to escape the carpetbagger label.