Senate Republicans on Wednesday fired a warning shot at Democrats on the White House’s still-unnamed attorney general pick as Majority Leader Harry Reid (D-Nev.) declared that front-runner Ted Olson would not be confirmed. The early sparring over the successor to Alberto Gonzales, who cedes power at the Justice Department on Friday, foreshadows a brutal confirmation battle to come. Minutes after Reid declared former solicitor general Olson was too partisan for the job, Minority Leader Mitch McConnell (R-Ky.) fired a salvo at Democrats who would delay Gonzales’s replacement. “If they were serious when they cried out for new leadership at the...