Late Tuesday on CNN, former Democratic presidential hopeful Andrew Yang, now a CNN contributor, warned that his old opponent, former Vice President Joe Biden could not defeat Trump with just a pledge to return to the years of former President Barack Obama alone.

According to Yang, it needed to start with an understanding of what problems facing the country led to Trump’s presidency.

“Donald Trump needs to be defeated,” he explained. “Forty-two percent of my supporters said they would not support the Democratic nominee in the general, in large part because when I ran, I ran for the problems that predated Trump. Like, Donald Trump would never be our president today if things were going well for a lot of people around the country. Bernie Sanders would not have almost been the nominee last time if things were going well for people around the country. So even as Joe Biden saying, ‘Hey, we need to defeat Donald Trump,’ he also has to say, ‘Look, things have not been working for millions of Americans, and after we defeat Donald Trump,’ we need to get deep into these problems, get our hands dirty and solve them. This can’t be a, ‘Hey, I’m better than Trump’ race. It has to be, ‘Hey. I understand how Trump became our president.'”

Yang told a CNN panel people were left behind in the Obama-Biden years, and they were not happy about it. He called on Biden to recognize that situation and address it, which he said would better his chances in the 2020 general election.

“I think he’s been talking about restoring a culture, tone and a soul of the country,” Yang added. “I was talking about putting more money in Americans’ hands because I saw we decimated entire ways of life in Michigan, Ohio, Pennsylvania, Wisconsin. And because I was talking in those terms about the real problems these people have experienced, again, 42% of my supporters were not going to support the Democratic nominee. I’m hoping that we can get some of those people to support Joe. But it would be helpful if Joe acknowledged it because one of the weaknesses of saying, ‘Hey, return to Obama years’ is that there are many Americans who were getting behind in those years, too, and they’re pissed off. And so, if you say, I’m going to revert, that loses to that group of people. There are so many Americans who just don’t think their institutions are working for him at all, and Joe Biden’s’s weakness is he represents those institutions. I’m endorsing Joe. We need Joe to beat Trump. But we’ll have a much better chance of that if Joe recognizes that our institutions have been failing many Americans for a long time.”

Follow Jeff Poor on Twitter @jeff_poor