<p>On Monday , Hillary Clinton's friends, aides, interrogators and anyone else wrapped up in the ongoing drama surrounding her email practices as secretary of state will be poring over the largest release yet of messages from the first four years of the Obama administration.</p><p>Her decision to use a private server, and whether that decision violated any State Department rules, has become the most intricate Clinton controversy since the long-running 1990s Whitewater land scandal, and the cast of characters in the drama continues to proliferate.