It seems like instructions on how to swap votes shouldn't be illegal.
There was a strange case here in Australia a few years ago, where a man (whose name I've forgotten, unfortunately) was telling people that they could vote 1,2,2,2,2 if they thought four of the candidates were equally unworthy of a vote (rather than the "correct" 1,2,3,4,5 preferential vote). This was apparently a deliberate loophole introduced so that if a person who made an honest mistake in writing 1,2,3,4,4 instead of 1,2,3,4,5 their vote would be counted so long as the result was decided without counting fourth preferences.
He was charged with some breach of the electoral act. The vote was considered legal, but telling people that it was legal wasn't. *shrug* Anyway, as a result of his going to court, more people found out about this quirk than would have if it was just one man's personal campaign.
I guess this doesn't really have anything to do with this story. :-) Except, maybe, "laws about voting are weird".
"I have no idea if it is true or not, but given what you read on the Web, it seems to be a valid concern." -jjayson