No, in November, the anti Landrieu vote is split and she wins with 50% +1. Of even more concern, a run off election between Landrieu and Cassidy. Landrieu and the Rats pour money into run off and dead arise from the grave to vote for her and she wins reelection.
A split in the anti Landrieu vote won't make the Landrieu vote go up. She will get the same 50% +1 or not whether the anti Landrieu vote is split or not.