This is all about the voice. Morgan Freeman has quite literally been cast as the voice of God more than once in his acting career, and it's easy to see (or should that be hear?) why. Freeman has the kind of voice that puts anyone at ease. He could be reading a menu or a telephone directory, and we'd still be quite content to close our eyes and listen to him until he was done.
Freeman is in his early 80s now, and so the prospect of a White House run has probably dwindled away to virtually zero, but we can still dream. No matter how bad things might get, and what Freeman might be required to tell the nation as its President, it would always sound like everything was going to be OK if he told us so. He'd be a Democratic President, having supported both Barack Obama and Hillary Clinton, but even a hardline Republican would struggle to avoid being won over by Freeman's dulcet tones.