My thoughts are the same, this was more a vote against Jindal.
Jindal’s unpopularity can be traced to the start of his second term in 2011, when he pushed through all the education reforms. The teacher’s union and the newspapers (they sleep together) vowed retribution and have worked 24/7 ever since to undermine Jindal.
As I noted upthread, I’ve had my differences with Jindal, but on balance, he’s been a net plus for Louisiana.