Obama to endorse Biden for president today

(CNN) — Former President Barack Obama will endorse Joe Biden on Tuesday, a source familiar with the plans tells CNN.

Obama will make the endorsement of his former vice president in a video message.

The endorsement reunites the former running mates and positions Obama, whose endorsement of Biden was seen as a forgone conclusion once Vermont Sen. Bernie Sanders dropped out of the race last week, to be one of Biden’s most powerful surrogates in the race against President Donald Trump.