Lauren Boebert is best known for her far-right Republican views.

But it wasn’t Republicans who were solely responsible for sending the Garfield County woman to Congress, a Colorado Sun analysis of voter registration data and the 2020 election results shows. Unaffiliated voters, who since at least February 2019 have made up the largest voting bloc in Boebert’s 3rd Congressional District, were the deciding factor in her victory last year.

“I like what she says,” said Joshua Burt, a 43-year-o...