One of the tactics is to spread rumour that Opp is winning. There are voters who are not happy and wouldn't mind reducing the % votes. However, they still hope that the incumbent will win. They just want to show their displeasure by reducing the % vote. Therefore, if words are going around that opp is winning, this group would not vote the opp. Quite a good tactic.
A typical sbf opposition supporter will come to sbf more often during the by elections.
A pap ib will come to sbf more often during the by elections.
A typical sbf opposition supporter will sometimes say that the opposition is winning because he thinks it will happen.
A pap ib will scare people into voting pap by saying that the opposition will win.
A typical sbf opposition supporter will badmouth KJ so that he won't split the vote that's better off going to WP
A pap ib will badmouth kj because he is after all the opposition.
A typical sbf opposition supporter will sometimes say that the PAP is winning because he is concerned it will happen.
A pap ib will manipulate people into voting pap by saying that the pap will win (and therefore why bother voting opposition?).
A typical sbf opposition supporter will whack the PAP because he's upset with the PAP.
A pap ib will whack the PAP in order to gain sympathy for the PAP.
Who gives a shit who is or is not a PAP IB? Just read what's there, think through it, if it makes sense then accept. If not then reject. And if you feel that the guy needs to be whacked, whack him. There's no need to make things so complicated.