We've found one issue which McCain will try distance himself from the Bush administration. From the NYT:

NEW ORLEANS -- ­Senator John McCain took direct aim at the Bush administration on Thursday as he stood in the lower Ninth Ward of New Orleans, the area hardest hit by Hurricane Katrina in 2005, and declared that "never again will a disaster of this nature be handled in the terrible and disgraceful way that it was handled."

That's pretty harsh, but probably necessary. Come the fall Katrina, along with a host of other issues connected to Bush and the GOP, will be back. Sowing the seeds early.