In this April 12, 2011 photo, former president George W. Bush makes 

In this April 12, 2011 photo, former president George W. Bush makes opening remarks at the The 4% Project, Driving Economic Growth conference at SMU in Dallas. Former President George W. Bush is skipping the Republican National Convention next month in Tampa, Fla., where presumptive GOP nominee Mitt Romney will officially become the party's standard-bearer.(AP Photo/Tony Gutierrez)
Associated Press
In this April 12, 2011 photo, former president George W. Bush makes opening remarks at the The 4% Project, Driving Economic Growth conference at SMU in Dallas. Former President George W. Bush is skipping the Republican National Convention next month in Tampa, Fla., where presumptive GOP nominee Mitt Romney will officially become the party's standard-bearer.(AP Photo/Tony Gutierrez)
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