President Barack Obama: I'm Praying for Whitney Houston's Daughter Bobbi Kristina

President Barack Obama is concerned about Whitney Houston's daughter Bobbi Kristina after her recent hospital scares ... this according to a rep for the White House.

Press Secretary Jay Carney just released a statement -- claiming Obama's thoughts and prayers are with Whitney Houston's family, especially her daughter.

TMZ broke the story ... Bobbi was taken to the hospital Saturday night and again on Sunday. We're told Bobbi was "hysterical, exhausted and inconsolable" after her mother's death.