Sen. John McCain, who has pushed for civility in this years presidential race, is warning that the biting attack on Senator John Kerry by a fellow Democrat at the Republican National Convention on Wednesday night might harm President Bush's efforts to woo swing voters. McCain said that the keynote address by Senator Zell Miller, (D-GA) could prove as controversial as a speech by Patrick J. Buchanan at the 1992 GOP Convention in Houston. 'I think it backfires,' McCain said of Miller's rhetorical assault on Kerry.He added that 'It makes Pat Buchanan's speech..look milquetoast.'McCain made his comments to reporters at a...