There are generally acknowledged to be six top-tier presidential candidates, three from each party. Three have released comprehensive catch-up Gulf Coast recovery plans: Hillary Clinton [1], John Edwards [2], and Barack Obama [3]
.
Three top-tier presidential candidates have not. And it's not as if at least one didn't get the chance [4].
Links:
[1] http://www.hillaryclinton.com/feature/katrina/?sc=8
[2] http://johnedwards.com/news/headlines/20070827-new-orleans-proposals/
[3] http://www.barackobama.com/pdf/KatrinaFactSheetFinal.pdf
[4] http://blog.nola.com/times-picayune/2007/07/mccain_in_new_orleans_for_satu.html