Arizona July 22, 2024 12:53 pm 5 things to know about Mark Kelly Here are five things to know about the former astronaut and Arizona senator. US & World Videos 0:55 Prop 5 explained: Lower voting threshold 1:02 Prop 4 explained: Climate bond 1:05 Prop 3 explained: Same-sex marriage 1:01 Prop 2 explained: School bond 6:49 NewsConference: Why turnout matters during elections