Associated Press: Four dollar-a-gallon gasoline has done something few Republicans thought possible a few months ago: given them hope. United behind a renewed push for offshore oil drilling, Republican members of Congress and the GOP’s presumptive presidential nominee, Sen. John McCain of Arizona, think they have found their best political issue of the 2008 campaign. McCain strategists and GOP leaders on Capitol Hill said the issue lets Republicans demonstrate their plans to address the anger caused by …