President Obama’s Supreme Court nominee was a key figure in covering up at least two of Bill Clinton’s scandals although the true extent of her role won’t ever be known because the files will remain secret. The Clinton Library has released more than 40,000 pages of records from Elena Kagan’s tenure as a top White House counsel, but the most substantive material is being withheld under executive privilege by a commander-in-chief best known for getting impeached by Congress and selling trade mission seats to Chinese Communists. The crucial files were requested by the Senate Judiciary Committee as it prepares for...