I'm glad you asked because I should clarify something. On a stock board, you can say that the CEO lied or even that he is a habitual, big fat liar. You cannot say that another poster lied or is a liar.
On a political board, you should be able to say that Mitt Romney (just to pick a name out of the air) is a tax evader as long as Mitt isn't posting on the board. BUT!!!
Political boards are pretty much considered to be private fiefdoms by Admin. Unless it is being moderated so poorly that the pollution is spreading or threatens to spread across the site, both Admins and Mod Squad tend to leave those boards alone.