The morning temperature is nearing 100 degrees Fahrenheit as Keith Seaman sweats beneath his bucket hat, walking door to door through the cookie-cutter blocks of a subdivision in Casa Grande, Arizona. Seaman, a Democrat who represents this Republican-leaning area in the state’s House of Representatives, is trying to retain a seat he won by a margin of around 600 votes just two years ago.

He wants to know what issues matter most to his constituents, but most of them don’t answer the door, or they say they’re too busy to talk. Those that do answer tend to mention standard campaign issues like rising prices and education — which Seaman, a former public school teacher, is only too happy to discuss.