I’m not so sure about that. Warren’s combatitiveness may have an unexpected upside. Besides slowing Bloomberg’s momentum, she may have borrowed something from him that could serve other Democrats well. Bloomberg rose in the polls not just because of his vast fortune, but how it was being deployed. His advertising has largely been pummeling Donald Trump — that’s the magic spot for a significant segment of the Democratic Party. Voters are gravitating, yes, to someone they think can beat Trump, but also someone ready to take the fight to him.