Kerry and Israel

So Kerry supports without the reservation the new policy of the Bush administration regarding Israel. On Meet the Press, Russert gave him a huge opening to distance himself in some way from that policy, by noting that it broke the precedent set by the previous six presidents.

???

I don't know where Kerry has been on the past in this issue. I mean, not many have been where Bush and Sharon are now, have they? Why doesn't he disagree in some way? The current policy seems enormously counterproductive.

What can people tell me about Kerry's past positions and why he might be taking this one now?