TOPEKA, Kan. (AP) — Democrat Sharice Davids of Kansas added her name Wednesday to her party's increasingly diverse slate of candidates advancing to the November ballot.

Davids, who would be the first gay, Native American elected to Congress, narrowly won a six-way primary in her eastern Kansas district, shattering the mold for a congressional primary winner in conservative Kansas and embodying the range of ethnicities and sexual orientations of Democratic candidates running throughout the country this fall.

Notably, the 38-year-old lawyer and activist from Kansas City, Kansas, is among a wave...