How do you deal with this situation?

[EnderW27]

With six, five and four people left in the tournament and the blinds at a high enough value to start stealing, I'm second in chips.
The problem is the chip leader is directly to my left and he has completely dominated the entire table. He has half the chips in play. I have a little less than 1/5th the chips in play and the rest of the table has between two and three blinds worth.

But here's the biggest problem: the chip leader, the one who has completely dominated the table, is just a loose calling station. He's played ABC poker, betting (and showing!) when he has the goods and just calling raises all over the place when he doesn't to hit his cards.

So now what? I feel handcuffed here. This guy isn't going to use his chip stack to steal the blinds of other players and I can't do it either because at any moment, this guy could end up calling me and that's the ballgame.

I ended up scratching my way into third place after the blinds hit me a few times because I just didn't know how to deal with this situation.