An official act is when you extort or blackmail an elected official. Basically, if you tell an elected official why he/she should vote on a certain act and even go so far as to say why he/she is a horrible person if they don't vote on the act, that isn't extortion. The legal line is crossed into extortion when you say to the elected official, "If you don't vote for this act, I am going to expose explicit photographs I have of you."