Prior to being non-elected President, George W. Bush was the governor of Texas for six years. It's legal to carry concealed weapons in Texas, so there's no reason for anyone to expect him to take any position on gun sales that would make the gun lobby unhappy.
Since the massacre at Columbine High School in Littleton, CO in 1999, Republicans in Congress have made at least two legislative efforts to make handguns and and semiautomatic weapons easier to obtain. Specifically, they have tried to repeal a District of Columbia law banning handguns and semiautomatic weapons, and they were doing so with full encouragement from the National Rifle Association.
Bush can go to Blacksburg, pray, and offer condolences, but it won't bring any of the 33 dead back to life. The adoption of changes to make events like this less likely will require a wholesale turnover of legislators in Washington. The current bunch obviously failed to learn any lessons from the Columbine High School massacre, and it's time to start placing serious blame. I believe that the public is way ahead of the politicians on this issue.
Bowling for Columbine Wikipedia entry