Where to watch as JD Vance, Tim Walz meet for vice presidential debate

Walz, the 60-year-old Minnesota governor, and Vance, a 40-year-old US senator from Ohio, have previewed potential approaches for weeks. Walz, before Harris selected him, was the Democrat who coined weird as a go-to pejorative for the Republican ticket. Vance assails the governor's progressive record as proof Democrats are too far left for voters.

Vance has mocked his fellow veteran's military service record. Walz hammers Vance's opposition to abortion rights and his views on family life. Both men have played up their small-town, middle-America credentials contrasts to Trump, the billionaire native New Yorker, and Harris, the California Bay Area native.

It sets up a potentially fierce night in Manhattan. Here are the dynamics to consider as the rivals meet face-to-face for the first time: