Babs kicked off yet another farewell tour in Philadelphia on Wednesday night and one of her guests was longtime fan and political compadre George W…OK, it was Bush impersonator Steve Bridges, the same guy who tag-teamed with GWB at the White House Correspondents Dinner. Babs’ shtick, the Philadelphia Inquirer reported, was to toss the faux Bush softballs “only to have him give glib, breezy answers, like proposing to solve the national debt by selling Canada. “They don’t use half of it!” he exclaimed.