Landrieu has close ties with the ACORN gang and other GOTV groups, so she will not be similarly neglected. If Cassidy is her runoff opponent, he better have a strong ground game in St. Tammany and Jefferson Parishes because those are the areas that can negate New Orleans.
There's one other thing I should probably mention: In Louisiana, Mary is primarily viewed as a New Orleans politician. That is not a positive factor throughout much of the state.
There is a fair chance that the LA runoff will decide who has the Senate majority. If so it will be a circus to end all circi (excuse my tortured Latin.)