By Michael D. Shear and Chris Cillizza Sen. John McCain has once again shaken up his campaign staff, reducing the role of campaign manager Rick Davis and vesting political adviser Steve Schmidt with "full operational control" of the entire campaign. Sources close to the campaign said Schmidt will continue to report to Davis, who will shift his attention to focus on fundraising, the selection of a vice presidential nominee and the running of the convention this August. The changes were announced in a staff meeting this morning. ...