Dan Newhouse

In February 2014, Newhouse entered the Republican primary for Washington's 4th congressional district. The incumbent, fellow 10-term Republican Doc Hastings, did not run in the 2014 elections.[6] He and fellow Republican Clint Didier advanced to the November election after finishing in the top two in the August primary election,[7] marking the first time that two Republican candidates would square off in a general election since the state adopted the "top two" primary system. However, the 4th has long been the most conservative district in Washington, and it was very likely in any event that Hastings would be succeeded by another Republican.

The race on November 4 was very close, and was seen as a battle between the factions of the GOP; Newhouse is considered a mainstream Republican, while Didier openly identified with the Tea Party movement. On November 4, 2014, Newhouse defeated Didier, by a margin of 51%-49%.[8][9]

Newhouse faced Didier in a rematch in 2016, placing first in the blanket primary with 44,720 votes (45.77%) to Didier's 26,892 (27.53%). In the general election, Newhouse decisively defeated Didier, by 132,517 votes (57.64%) to 97,402 (42.36%).

In December 2020, Newhouse was one of 126 Republican members of the House of Representatives who signed an amicus brief in support of Texas v. Pennsylvania, a lawsuit filed at the United States Supreme Court contesting the results of the 2020 presidential election, in which Joe Biden prevailed[10] over incumbent Donald Trump. The Supreme Court declined to hear the case on the basis that Texas lacked standing under Article III of the Constitution to challenge the results of the election held by another state.[11][12][13]

House Speaker Nancy Pelosi issued a statement that called signing the amicus brief an act of "election subversion." Additionally, Pelosi reprimanded Newhouse and the other House members who supported the lawsuit: "The 126 Republican Members that signed onto this lawsuit brought dishonor to the House. Instead of upholding their oath to support and defend the Constitution, they chose to subvert the Constitution and undermine public trust in our sacred democratic institutions."[14][15] New Jersey Representative Bill Pascrell, citing section three of the 14th Amendment, called for Pelosi to not seat Newhouse and the other Republicans who signed the brief supporting the suit. Pascrell argued that "the text of the 14th Amendment expressly forbids Members of Congress from engaging in rebellion against the United States. Trying to overturn a democratic election and install a dictator seems like a pretty clear example of that."[16]

Newhouse announced his support for the second impeachment of Donald Trump on January 13, following the 2021 storming of the United States Capitol.[17] In a statement, Newhouse condemned the "hateful and anti-American extremists" who attacked the Capitol, saying that they had been incited by "the language and misinformation of the President of the United States." He claimed that he could not appear to condone the "unacceptable violence" or Trump's "inaction" by voting against impeachment, saying that Trump "failed to fulfill his oath of office" by not responding sooner.[18] He ultimately voted in favor of impeachment alongside nine other Republicans later that day.[19] In his speech supporting impeachment, Newhouse said that while the article charging Trump with "incitement of insurrection was "flawed," he also believed there was "no excuse" for Trump's failure to act. He also expressed regret for not speaking out sooner against Trump's effort to overturn the election. Earlier, he told The Spokesman-Review that while he was a Trump supporter, he believed Trump "let us down" by not doing more to stop the violence.[20]

• Congressional Western Caucus[21]
• Republican Main Street Partnership[22]
• Republican Study Committee[23]
• U.S.-Japan Caucus[24]