LAS VEGAS (AP) --
A growing number of Democratic members of Congress, union officials, state leaders and party strategists agree that Bernie Sanders is a problem.
But on the eve of the third contest of the 2020 primary season, the Sanders critics are further than they've ever been from coalescing behind a single moderate alternative.
And with fear and frustration rising in the party's establishment wing, they acknowledge that the expanding group of viable center-left candidates still in the race represents a high-stakes math problem.
And that problem widens the democratic socialist's path to the nomination, no matter how loud they might complain.