I'm confused, it seems your correspondent has already acknowledged that Clinton lied. ("Nobody Died When Clinton Lied", true or not, is an acknowledgment that Clinton lied about something.)
I'm also confused because I can't for the life of me figure out when it's been established that Bush lied, and about what.
So as it stands you are debating someone who has acknowledged that Clinton lied, and (I can only assume) can't point to a real, serious instance of Bush "lying".
Why not declare victory and end it there. If he objects, ask him to explain what Bush has "lied" about, and prove that it was a "lie". I'll bet he can't.
Dr. Frank is right.
Some people will remain forever willfully blind; only the squishy middle is salvageable.