With Trump's approval near 32% and voters of both parties unhappy, can a dissatisfied electorate decide the future of America? Ahead of Tuesday's midterms, NPR's Tamara Keith explains why affordability, the Iran war, and redistricting make this election unusually unpredictable. Historically, the president's party loses ground in midterms, and some experts predict a blue wave, while President Trump insists Republicans will hold both chambers. Keith draws on a year of conversations with swing voters, many of whom gave the president failing grades and described the country as anxious and divided. She also breaks down record spending, with ad outlays reaching $11.55 billion, and the Texas Senate race that has become the most expensive in the country. Listeners get a clear primer on the races to watch on election night and the risks of contested results. NPR polling shows 32% of Americans approve of President Trump's job performance, while nearly two-thirds disapprove.