Stanley Toshi Matsunaka (born November 12, 1953) is a former Democratic member of the State Senate of the U.S. state of Colorado, serving from 1995 to 2003. He served as President of the Senate for two years. In both the 2002 and 2004 congressional elections, Matsunaka lost to Republican Marilyn Musgrave for the 4th District of Colorado in the United States House of Representatives.
Matsunaka is a Japanese American native of Akron, Colorado, whose grandparents settled in the state in the early 20th century. He grew up in rural Weld County near Fort Morgan and is a graduate of Colorado State University. Matsunaka later moved to Loveland and was elected to the Colorado State Senate.
In 2002, Matsunaka ran against fellow state senator Musgrave for the open seat in the 4th District, which includes the cities of Greeley, Loveland, Longmont, and Fort Collins, as well much of the Colorado Eastern Plains; he lost to Musgrave 42%-55%.
In 2004, he again challenged Musgrave, now the incumbent, who had attracted controversy in the district for her sponsorship of the Federal Marriage Amendment. In addition to his accusation that Musgrave is a "one trick pony," Matsunaka also claimed that Musgrave had poor constituent services and did not give enough attention to the district's needs. This time, the election was far closer and was not decided until the last returns came in. Musgrave won by six points (51-45%) — the closest margin in the district since 1974. Matsunaka won two of the three biggest counties in the district — Larimer County (including Loveland and Fort Collins) and the district's share of Boulder County (including Longmont). However, Musgrave soundly defeated him in Weld County (including Greeley); he would have unseated Musgrave had he won there.
Despite the surprisingly close 2004 results, Matsunaka ruled out another run.