Even if they figure it out after the fact that they may have been duped, there's no criminal liability in that scenario. Most crimes have an intent at time of crime component (knowingly, willingly, intentionally, wanton disregard), which you don't have in the after the fact scenario. Now, I don't know enough about the ballot procedures, so maybe you get criminal liability out of ignorance of the law (doing something illegal, not knowing it is illegal). I just see statements like these as javelin catching, which innocent people usually don't make.

This could also be a state difference, as here we have cases dealing with these common carrier entities and liability.