The independent senator from Vermont understands something that President Obama did not when he first took office:

“I think maybe he has learned something,” Mr. Sanders, 71, said of the president, who is 20 years his junior. “After four years he has gotten the clue that you can’t negotiate with yourself, you can’t come up with a modest agreement and hope the Republicans say, ‘That’s fair, you’re O.K., we’ll accept that.’ He’s reached out his hand, and they’ve cut him off at the wrist.”

The rest of the article is worth a read.