Leading Democrats To Bill Clinton: Pipe Down By Jonathan Alter NEWSWEEK Updated: 1:43 PM ET Jan 19, 2008 Prominent Democrats are upset with the aggressive role that Bill Clinton is playing in the 2008 campaign, a role they believe is inappropriate for a former president and the titular head of the Democratic Party. In recent weeks, Sen. Edward Kennedy and Rep. Rahm Emanuel, both currently neutral in the Democratic contest, have told their old friend heatedly on the phone that he needs to change his tone and stop attacking Sen. Barack Obama, according to two sources familiar with the conversations...