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To hear the Democrats tell it, former President Barack Obama and Joe Biden are two brothers from a different mother. But according to an upcoming book, there was no love lost between Obama and his vice president.

The 'bromance' between Barack Obama and Joe Biden was more of a figment of Biden's imagination, according to the book: Barack and Joe: The Making of an Extraordinary Partnership.

The book, written by Steven Levingston, is set to be published by Hachette Books on October 8.

The book explores the secret animosity Obama held for Biden, whom he refused to endorse in 2016 or 2020.

"Barack had placed his bet on Hillary, the one he believed would confirm his revolutionary stamp on American's political culture - the first black president passing the baton to the first woman president," Levingston writes.

To save face, Biden claims he never asked Obama to endorse him, but he was offended when Obama met with other potential presidential candidates.

During a rambling speech by Biden in the early 2000s, Obama rolled his eyes and passed a note to his adviser Robert Gibbs, saying: "Shoot. Me. Now."

According to Levingston, Obama harbored a thinly veiled hatred for bumbling Joe Biden. He thought Biden was error prone and had a fast and loose tongue.

Obama reportedly with Biden to ask him not to run for president. Obama's choice for the nomination is California Senator Kamala Harris.