The problem with John Kerry's flip-flopping is that it has been on EVERYTHING. And his position on a whole host of issues is dependant upon who he is speaking too. Recently he spoke to an arab/palestinian group and gave a speech in opposition to Israel's "security fence." But then days later, while speaking to a jewish group he came out in whole hearted support of the security fence, going as far as to say it was essential to Israels future.
The list of such examples is virtually endless.