Vice President and Democratic presidential nominee Kamala Harris has picked Minnesota Gov. Tim Walz to be her running mate, according to multiple reports.So, who is Walz? Here's what to know: Walz was elected as Minnesota's governor in 2018 and won re-election in 2022. He was born in West Point, Nebraska, a community of about 3,500 people northwest of Omaha. He attended Chadron State College, a public college in Chadron, Nebraska, graduating in 1989 with a social science degree. Walz later joined the Army National Guard and became a teacher in Nebraska.He and his wife moved to Mankato in southern Minnesota in the 1990s. That's where he taught social studies and coached football at Mankato West High School, including for the 1999 team that won the first of the school's four state championships. He still points to his union membership there.Walz served 24 years in the Army National Guard before retiring from a field artillery battalion in 2005 as a command sergeant major, one of the military's highest enlisted ranks.In addition to being a military veteran, Walz is a union supporter who helped enact an ambitious Democratic agenda for Minnesota as governor, including sweeping protections for abortion rights and generous aid to families.Walz, 60, has taken on greater national visibility since a 2023 legislative session that he calls one of the most consequential and productive in state history. He was elected chair of the Democratic Governors Association in December. He has served often as a Joe Biden-Kamala Harris advocate, and has made increasingly frequent appearances on national television.Walz won the first of six terms in Congress in 2006 from a mostly rural southern Minnesota district, and used the office to champion veterans' issues. He served 24 years in the Army National Guard, rising to command sergeant major, one of the highest enlisted ranks in the military. When first elected governor in 2018, Walz had to find ways to work with a Legislature that was split between a Democratic-controlled House and a Republican-led Senate. Minnesota has a history of divided government, though, and the arrangement was surprisingly productive in his first year. But the COVID-19 pandemic hit Minnesota early in his second year, and bipartisan cooperation soon frayed.Walz won reelection by nearly 8 points in 2022, and Democrats kept control of the House and flipped the Senate to win full control of both chambers and the governor’s office for the first time in eight years.Walz and other Democrats went into the 2023 legislative session with an ambitious agenda — and a whopping $17.6 billion budget surplus to help fund it. Their proudest accomplishments included sweeping protections for abortion rights. They also enacted new protections for trans rights, making the state a refuge for families coming from out of state for treatment for trans children. The Associated Press contributed to this report.