Bush on Social Security

Question: Why is President Bush so intent on changing Social Security? Politically, it's going to be a tough sell. The crisis point is years in the future. Can he really get it done? Can he gain from this?

Some people will say it's because he believes it,so he's doing it, even if it's going to be politically tough. Alright, but just because he believe is doesn't mean I have to agree with him that we have a crisis or that his plan is the way to deal with it.