UPDATE: U.S. Democratic Rep. Mazie Hirono defeated former Hawaii Gov. Linda Lingle on Tuesday night, according to the Associated Press. Ms. Hirono becomes the Aloha State’s first woman senator as well as the first Japan-born immigrant to be elected to the U.S. Senate.

As Japan’s politicians jockey over when to hold the next general election, one of Japan’s own is on the cusp of making U.S. election history.

Recent polls show Democratic Rep. Mazie Hirono is favored to win the open Senate seat in Hawaii when voters cast their ballots Tuesday. If successful, Ms. Hirono will usher in a wave of firsts. She will be the first Japanese immigrant to be elected senator. She will also be the first Buddhist and Asian-American woman. She will be the first woman senator to represent the Aloha State, and is already the first foreign-born woman of Asian ancestry to be sworn into Congressional office.

The 65-year-old congresswoman was born in Fukushima, the northeastern prefecture where the tsunami-damaged Fukushima Daiichi nuclear plant is located. When she was 8 years old, her mother moved the family to Hawaii. Ms. Hirono once said the immigrant experience and being raised by a single mother in economically difficult circumstances made her a “feisty and focused” lawmaker. She became a naturalized citizen in 1959, the same year Hawaii became a state.

Regardless who wins, Hawaii will get its first woman senator. Ms. Hirono, currently serving her third term in the House of Representatives, is up against former Gov. Linda Lingle, a Republican and long-time political rival to whom Ms. Hirono lost the 2002 gubernatorial race. The two women are chasing the seat opened up by Hawaii’s 88-year-old junior senator, Daniel Akaka, a Democrat. After a 36-year career, Mr. Akaka, the Senate’s only Chinese American, announced his retirement last year.