I think that if Cho is lynched (and to be honest, she really should be. Myrtle is just too convienient I think.) then no matter what she flips, I should be investigated tonight. People are going to come up with various scenarious such as Death Millers and the like, so it's just best to lay all that to rest before it begins. Hopefully with a proven mafia (as I genuinely believe her to be) dead and a clear investigation to my name, I'll be trusted.
Obviously any jailkeepers should make me their target tonight, and any doctors/faith healers/white mages/bodyguards/etc. should protect Draco.