Campaigning against DJT is no picnic as HRC discovered in 2016. BHO didn't have to work very hard to beat either McCain or Romney. But Michelle would really have to work b/c Trump will not go down so easily. It was Hillary's laziness that lost her the race (that and how unlikeable she is). If you recall, Hillary was the "world's most admired woman" after Bill left the White House, too. I think Michelle is very similar: a nasty, unpleasant and angry woman who is popular unless people get to know her.
Well, she has those muscular biceps and all. #;^}