"[2] Members of Mainstream Republicans of Washington include former congressman Sid Morrison, former secretaries of state Ralph Munro and Sam Reed, former lands commissioner Doug Sutherland, and state legislators Gary Alexander, Steve Litzow, and Hans Zeiger.

[3] Rodney Tom, a one-time Republican state legislator who switched to the Democratic Party, is a former member of the group's board of directors.

[6] The 2013 event featured a speech by Tacoma mayor Marilyn Strickland, a Democratic Party activist who had previously made headlines when she described Republicans as "racist," a remark for which she later apologized.

In 2013 the group's executive-director called on the Republican Party to eschew conservative candidates in favor of those likely to "attract more people living in the middle of the spectrum.

[11] In 2005 Mainstream Republicans came out in opposition to Washington Initiative 912, a ballot measure that would have repealed a 9.5-cent gas tax enacted by the state legislature.

[14] The 2013 election season also saw Mainstream Republicans of Washington come out against Initiative 522, which would have required labeling of genetically modified foods.

[15] Other recent candidate endorsements the group has made include Joe Fain, Dick Muri, Jan Angel, and Kim Wyman.