I came across this today:
Anti-abortion preacher petitions to get Tiller's shooter pardoned
Now I'm hardly convinced that Bush would pardon Shannon, unless of course he really doesn't care what sort of legacy he leaves behind (which wouldn't be too surprising all things considered) and would actually pardon a convicted murderer.
I'm more thinking of the consequences of a pardon. If Bush were to pardon Shannon today, it would open the doors for other clinic bombers/murderers to be pardoned over the next month. Plus, it would probably create more clinic violence under future anti-choice presidents.