Barack Obama left his closest ally speechless.

The former President made a decision that could change everything in the 2020 Presidential race.

And it is the most stunning act of betrayal that you will ever see.

In the 2016 contest, Obama staffers endorsed Hillary Clinton in the Democrat Presidential primary.

This show of force helped convince Vice President Joe Biden to take a pass on running in 2016 since Hillary Clinton appeared unbeatable.

Fast forward to 2020, and Biden is now the assumed establishment frontrunner in the race.

But Obama and his aides’ silence on Biden speaks volumes.

Neither the former President, nor his former campaign and White House staff, has rushed to support Biden.

And this shows that, despite his commanding lead in the early polls and massive fundraising haul, Biden is a vulnerable front-runner.

The Washington Post spoke to 53 former Obama White House and campaign staffers, as well as cabinet officials, to get a sense as to why the Obama team did not race to endorse the man who loyally served their boss for eight years.

The Post exclusively reports:

President Trump proved a wily campaigner, able to spark real enthusiasm among his core voters. Several of Obama’s generation said they worried about how Biden would match up against Trump were he to win the nomination.

“I think the question that we all have in our minds from an electoral standpoint is what do two 75-year-olds fighting against each other look like,” said one former campaign and White House aide who spoke on the condition of anonymity to preserve relations. “Does that scream the future? Does that scream contrast?”

In their interviews, the Post also found that some of Obama’s underlings had narrowed their choice of candidates down to a pool of five – and Biden was one of the finalists.

The Post also exclusively reports:

The former aides split broadly into three groups. Only eight had committed or were leaning toward Biden. A second group of 11 have committed to other candidates. A group of 34 say they are still waiting to decide.

Among those who had not yet picked a favorite, there was remarkable unanimity of preferences: Almost all said they had limited their consideration to five candidates now in the sprawling field: Biden, South Bend, Ind., Mayor Pete Buttigieg, Sen. Kamala D. Harris (Calif.), Sen. Elizabeth Warren (Mass.) and former congressman Beto O’Rourke of Texas.

There is no doubt that Obama could end all of this by endorsing Biden.

But Obama pointedly did not do so.

It was the one blemish on Biden’s campaign rollout.

And it led many pundits to wonder if Biden’s strong early poll numbers were a mirage.

In the 2008 election, Rudy Giuliani and Hillary Clinton entered the race with massive poll leads, only to stumble once voters focused in on the other candidates and the race began.

There are some who think Biden’s early strength is due to name recognition and voters buying into the media narrative that he is the “most electable.”

But Rudy and Hillary had both of those factors seemingly in their favor in 2008 and they still crashed and burned.

Is Obama sending signals to his people that they should cool their jets on Biden because he sees the same happening to Biden?

We will keep you up to date on any new developments in this ongoing story.