re: Tell me about voting in Louisiana...

That was an aberration. Roemer is to that election what Texas A&M was to their game against UCLA. He committed every possible sin a republican could indulge in:
He appointed a radical environmentalist (whom he was sleeping with) to head DEQ
He hacked off the teachers and all public employee union members with reform attempts
He thumbed his knows at industry (you know, the money who elected him) with tax increases

Basically, Roemer abandoned his base while spitting on his opponents, leaving him hated by everyone. Duke was just the only one left to take those votes after Buddy self-destructed.