Brutal Heat Changes How Campaigns Woo Voters in Two Swing States

The candidates vying to represent Arizona’s 3rd congressional district, which includes much of Phoenix, disagree sharply about climate change. Democrat Yassamin Ansari wants to accelerate the transition away from fossil fuels and embraces the overwhelming scientific consensus that human activity drives global warming. Republican Jeff Zink supports the US pulling out of the Paris climate accord in recognition of “divine control over Earth’s phenomena.”

But there’s no denying that the heat in Phoenix can pose a serious danger. Temperatures in the city have now topped 100F (38C) for more than 100 consecutive days. Both candidates have adjusted their campaigning plans to keep themselves and ...