Any time they start sweating its usually because some kind of scam is going down. For example, here in Texas it is illegal for the precinct workers to let anyone know who has voted and who has not. However, democrat workers often call party workers to let them know who has not voted so that they can send a van to pick the voter up and get them to the polls. Being involved in the process will allow you to understand how fraud can be perpetrated, so once again, get involved.
They did that in New Orleans when Blanco was trailing at the polls. They seemed competent at getting buses out and about (loaded with free food, drinks and dixie land jazz) when their power was at stake.
Getting the buses out during Katrina wasn't so important. The dead still vote Democrat.