The articles I'm reading this morning say that 70% of citizens polled felt stem cell research should be explored/funded by the government. I'm no Bush fan and I'm delighted to see him in the position of having to either placate his conservative religious buddies or follow the wishes of the American people and recommendations of scientists.
Do I think the needs of people with debilitating diseases/conditions outweigh the (alleged) "rights" of an unwanted bit of embryonic tissue? Do I think the needs of those same people are less important than the (alleged) "soul" of an unwanted bit of embryonic tissue?
Do you need to ask me that question? No, I didn't think so.

(As someone who lives daily with considerable pain, doing everything possible to delay replacing both deteriorating knees, I'm solidly in favor of any technology which might make regrowth of cartilege possible.)
But, I digressed. You asked if Bush will really use the veto? Even though I imagine his staff has spent sleepless nights trying to extricate him from this mess, I believe he'll ultimately climb on his sanctimonious soap box and veto it. If there's not enough support to override him
THIS TIME, I believe that time will come.