text:  The sense of drama is mounting as the debate between a former and a sitting president looms. The debate could make or break the presidential ambitions of both President Biden and former President Trump. This is not a reality show. This is reality. Sara DePerry, a former speechwriter for President Obama, says the debate will be about substance, but it's also about style. This will have a very different tone, I think, and in a way maybe make the stakes feel higher.