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A past election judge, precinct chairman, and delegate to Republican state conventions, Shaheen is the founding chairman of the political action committee, the Reagan Conservative Society. He is a member of the Collin County Republican Men's Club.<ref name=mfshaheen/>  

A past election judge, precinct chairman, and delegate to Republican state conventions, Shaheen is the founding chairman of the political action committee, the Reagan Conservative Society. He is a member of the Collin County Republican Men's Club.<ref name=mfshaheen/>  

Shaheen won the Republican nomination for the District 66 House seat in a runoff election on May 27, 2014, with his intraparty rival, lawyer and businessman Glenn Brian Callison (born 1963), also of Plano, 54 to 46 percent.  The district encompasses most of West Plano and parts of  North Dallas. In that same primary, Susan Fletcher unseated Mark Reid, the Precinct 1 commissioner, who was appointed in December 2013 to succeed Shaheen, when he stepped down to make the state House race.<ref name=starlocal>{{cite web|url=http://starlocalmedia.com/allenamerican/news/fletcher-shaheen-win-in-collin-county-republican-primary-updated/article_30ca83b4-e5fc-11e3-ab4c-001a4bcf887a.html|title=Fletcher, Shaheen win in Collin County Republican primary|date=May 28, 2014|publisher=starlocalmedia.com|accessdate=December 6, 2014}}</ref>Shaheen, with no [[Democratic Party|Democrat]] opponent, then defeated the [[Libertarian Party]] candidate, Ian Michael Santorella (born 1980), also of Plano, in the November 4 [[general election]]. The departing representative, Republican [[Van Taylor]],  succeeded state Senator [[Ken Paxton]] of McKinney, the  state attorney general.<ref name=starlocal/>

Shaheen won the Republican nomination for the District 66 House seat in a runoff election on May 27, 2014, with his intraparty rival, lawyer and businessman Glenn Brian Callison (born 1963), also of Plano, 54 to 46 percent.  The district encompasses most of West Plano and parts of  North Dallas. In that same primary, Susan Fletcher unseated Mark Reid, the Precinct 1 commissioner, who was appointed in December 2013 to succeed Shaheen, when he stepped down to make the state House race.<ref name=starlocal>{{cite web|url=http://starlocalmedia.com/allenamerican/news/fletcher-shaheen-win-in-collin-county-republican-primary-updated/article_30ca83b4-e5fc-11e3-ab4c-001a4bcf887a.html|title=Fletcher, Shaheen win in Collin County Republican primary|date=May 28, 2014|publisher=starlocalmedia.com|accessdate=December 6, 2014}}</ref>Shaheen, with no [[Democratic Party|Democrat]] opponent, then defeated the [[Libertarian Party]] candidate, Ian Michael Santorella (born 1980), also of Plano, in the November 4 [[general election]]. The departing representative, Republican [[Van Taylor]],  succeeded state Senator [[Ken Paxton]] of McKinney, the  state attorney general.<ref name=starlocal/> Since then he has won re-election in 2016, 2018, and 2020; however the 2020 race was extremely close (due to Collin County becoming more Democrat due to Californians moving into the county), leading to speculation that either his or Leach's district will be surrendered to the Democrats when the Texas Legislature redraws districts in 2021.

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