Despite his complete silence in the primary campaign for the Democrats, former US President Barack Obama appears strongly present in the heated battle between the candidates to win the Democratic nomination for the presidential elections in November.

As his name appears dozens of times during the debates, and his campaign posters present his campaign posters, Obama remains silent despite his behind-the-scenes warnings of directing the rudder to the left as Bernie Sanders promises.

"The elite panic" or "Bernie Sanders' nomination against Trump would be a crazy act." This is what the US media called, an expression of the plight of some moderate Democrats who consider themselves close to Obama.

They are concerned about the rise of the candidate who presents himself as a "socialist" to confront Republican President Donald Trump on their behalf during the presidential elections in November.

After his good results in the first states that voted, the independent Senator, at the age of 78, became the favorite to win the Democratic primary.

Sanders may make progress during the "big Tuesday" elections, which virtually nothing will stand in his way to win the party's nomination.

"Most of the democratic elite has the conviction that there is only one way to stop or at least slow Sanders:" Barack and Michelle Obama will declare "their support for another candidate," preferably before "Big Tuesday," he wrote to CNN.

In November, Barack Obama announced to Democratic donors that winning the election battle would be through the middle.

He said that the Americans do not believe "that we must completely destroy the system and start again", stressing that the United States is not a "revolutionary" country. If he did not name anyone, everyone understood that it meant Bernie Sanders, who was defending a political "revolution".

Also in the fall, Politico said that the ex-president had intended to speak publicly if the senator appeared to be clearly advancing in the primary campaign "to prevent his choice".

Obama also said - Kyle Condic, a professor of politics at the University of Virginia, says Barack Obama is still "very popular in the Democratic Party." Therefore, his vote will have a strong impact if he sits with one of the candidates. But he is unlikely to express his opinion publicly.

His spokesperson, Katie Hill, said that he «said he does not intend to support any candidate during the primaries» knowing that «many of his friends are competing to win, including of course his former deputy» Joe Biden «because he believes that in order for Democrats to win in the fall, voters must choose their candidate» .

In 2016, Obama only announced his support for Hillary Clinton after she was confident of winning the Democratic nomination.

But he interfered in foreign elections, so he declared his support for Emmanuel Macron in France and Justin Trudeau in Canada during their campaigns.

In a statement said uniquely to Obama's communications director, Katie Hill condemned a group supporting Donald Trump who said she had broadcast a "sordid advertisement" in which earlier words of Barack Obama were used "out of context" to harm Biden.

However, the former president remains silent on several electoral posters for candidates who use his old sermons to suggest that he is supportive of them.

From Joe Biden to billionaire Michael Bloomberg, progressive senator Elizabeth Warren and former mayor Pete Bottledge: they all highlight their distinctive relationship with him, agree with him and represent a continuity of his legacy ... and all quote him to support their positions.

"As Barack Obama has said, we have to take into account the position of the electorate in this country," wrote Amy Kloppuchar on Thursday, on Twitter denouncing the Bernie Sanders program. But spending nearly $ 60 trillion is not what they want. ”

With the exception of Bill Clinton, who supported his wife Hillary during the 2008 and 2016 primaries, "many of the former presidents have tried to stay aloof from the political battle," said Kylie Condic.

There is currently no "indication" that Barack Obama is about to break with this tradition.