"The Democratic pollster Stanley Greenberg delivered a warning to his party on Monday, saying there's a possibility it's at risk of losing working-class voters of color.

"After studying working-class voters for nearly four decades, I believe the trajectory can be shifted or reversed. But there is no room for error. There is no room for fools," Greenberg wrote in the magazine American Prospect.

Greenberg also said Democrats' perceived strength was hurting the party, arguing against using high-profile campaign appearances by former President Barack Obama.

Obama's rallies "helped motivate Republican voters to vote but had disappointing results for Democrats," Greenberg wrote."

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