President Bush, reversing a longstanding position, will call on Congress on Wednesday to end a federal ban on offshore oil drilling, according to White House officials who say Mr. Bush now wants to work with states to determine where drilling should occur. The move underscores how $4-a-gallon gas has become a major issue in the 2008 presidential campaign, and it comes as a growing number of Republicans are lining up in opposition to the federal ban. New York Times