 Hi, I'm Jen White. And I'm Todd Zwilling. The attempt to assassinate Donald Trump is the most serious attack on an American president or ex-president since 1981. That's when John Hinckley shot and wounded Ronald Reagan. President Biden addressed the nation last night with a plea to cool it down. Today, our weekly series, If You Can Keep It, looks at how this attack will shape the campaign and the tone of those who are asking for your vote in November. What, if anything, do you expect will change?