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John McCain's post-convention bounce owes in part to the increase in support he has drawn among independents and even some Democrats, according to a Gallup analysis of its polling for Aug. 29-31 and Sept. 5-7. His backing from independents rose from 40 percent to 52 percent and among Democrats from 9 percent to 14 percent. Prior to this sampling, McCain had received no higher than 48 percent of the independent vote and Obama no higher than 46 percent. Twenty percent of "pure" independents - those with no leaning towards either party - backed McCain before the convention, a number that has grown to 39 percent.