I hate to be politcal, but I think the best way to save Hubble is to defeat Pres. Bush this November. The most important reason that Hubble is being abandoned is so that NASA can use the money for the manned moon and Mars project. From a scientific point of view, this manned mission has very little value compared to Hubble and future space telescopes.
For those who were not around at the time, the Apollo project was motivated more by the cold war than anything else.