I don't know that Kerry is push polling and neither do you.
I don't know that he's dirty tricking and neither do you.
I think there may be some isolated incidents, like in the caucuses.
But I think the bulk of dirty tricks are from paid GOP operatives and Freepers.
It sows a bad feeling, no matter who wins.
I also happen to think it's deliberately designed to produce the worst nominee, or they'd be dirty tricking Kerry, but I could be wrong about that too.