The Democratic Party is longing for the past. They want a "Bubba" Bill Clinton clone back in the White House, since he was the last popular Democrat who served as President, in spite his weakened foreign policy and weakening moral character.
The Adolescent Clinton Presidency appeals to that party, because the United States witnessed unprecedented growth and enjoyed a budget surplus for the first time in decades. All of this came about because of a stauchly Republican Congress, the first in four decades, which campaigned on the promise to balance the budget and force the government to live within its means. Clinton was a better media personality, plus the fact that the press has a penchant for liberals, especially when they (reluctantly) govern.