We Won't Win, So We Won't Have One

Tony Blair has decided that we now no longer need a referendum on an EU constitution. He claims this is because the new constitution is not as significant as what was originally proposed. The real reason is that he wouldn't win it.

Why not let us decide whether the changes are fundamental or not?

Why is he making the decision when he is going to announce that he is standing down in a matter of days? Is he trying to get this done and dusted before his successor can out a stop to it as another way of improving the possibility of becoming EU President?