It can't possibly be due to the fact that the Vice President is the head of the National Space Council and all of this could be easily politicized - could it? Loss of the craft and/or loss of the crew would be a huge propaganda win for Republicans - much better to try to push this down the road and make sure everyone knows it's not NASA's fault.
Ironically it's an echo of the push to launch Challenger so President Regan could highlight the "teacher in space" in his SOTU scheduled for that night....