Minnesota Gov. Tim Walz accepted his party's nomination for vice president Wednesday and used his Democratic National Convention address to thank the packed arena for “bringing the joy” to an election transformed by the elevation of his running mate, Vice President Kamala Harris. “We're all here tonight for one simple, beautiful reason: We love this country," Walz said.

Democrats gathered at Chicago’s United Center are hoping to build on the momentum Harris has brought since taking over the top of the party’s presidential ticket last month. They want to harness the Democratic exuberance that followed President Joe Biden stepping aside while also making clear to their supporters that they face a fierce battle with former President Donald Trump. Many Americans had never heard of Walz until Harris made him her running mate.

In his first weeks of campaigning, he’s charmed supporters with his background and helped to balance Harris’ coastal background as a cultural representative of Midwestern states whose voters she needs this fall. But Walz also has faced scrutiny, including questions about embellishing his background. His wife this week clarified that she did not undergo in vitro fertilization, as Walz has repeatedly claimed, but used other fertility treatments.

Republicans also have criticized Walz for a 2018 comment he made about carrying weapons in war. Though he served in the National Guard for 24 years, he did not deploy to a war zone. Benjamin C.

Ingman, one.