Will Hillary face a challenge from the left?

(CNN) – Is there any hunger on the left for an alternative to Hillary Clinton? As of now, so many potential presidential hopefuls are waiting to see what she does, and if she runs they won't.

But should they be thinking that way?

When Massachusetts Sen. Elizabeth Warren told a crowd in Washington, D.C., Thursday that she is not running in 2016, the audience booed that decision.

The Clinton coronation has some liberal circles nervous. They see her as too pro-Pentagon, too pro-Wall Street, and they are not so quietly searching for a candidate to come at Clinton from her left flank.

CNN political analyst and Politico writer Maggie Haberman weighs in.