 Thursday night is the first presidential debate of the general election. And what the candidates do could matter as much as what they say. Donald Trump's going to treat that like the 100 meter dash. Smile, the double thumbs, you know, getting to the middle stage before Joe Biden. I'm Ari Shapiro. Substance and style in the presidential debate on all things considered from NPR News. Today at 4 p.m. on Delaware Public Media.