( CNN) Former President Barack Obama is adding his voice to the Alabama Senate race, praying voters to go to the polls Tuesday to reject the candidacy of Roy Moore as part of an aggressive try by Democrats to try and counter President Donald Trump’s full-throated endorsement of the controversial Republican candidate.

“This one’s serious, ” Obama says in the bellow. “You can’t sit it out.”

Two Democratic officers familiar with the Alabama race tell CNN that Obama recorded the phone message in recent periods, at the very hour Trump stepped up his own involvement in the campaign with a recorded message. Obama does not mention Moore by name.