Editing Allegheny County, Pennsylvania (section)

===Political history===
The [[Republican Party (United States)|Republican Party]] had been historically dominant in county-level politics in the 19th and early 20th centuries; prior to the [[Great Depression]], Pittsburgh and Allegheny County had been majority Republican. Since the Great Depression on the state and national levels, the [[Democratic Party (United States)|Democratic Party]] has been dominant in county-level politics. It is by far the most Democratic county in western Pennsylvania. For much of the time between the Great Depression and the turn of the millennium, it was the second-strongest Democratic bastion in Pennsylvania, behind only Philadelphia.

In 2000, Democrat [[Al Gore]] won 56% of the vote and Republican [[George W. Bush]] won 41%. In 2004, Democrat [[John Kerry]] received 57% of the vote and Republican Bush received 41%. In 2006, Democrats Governor [[Ed Rendell]] and Senator [[Bob Casey Jr.]] won 59% and 65% of the vote in Allegheny County, respectively. In 2008, Democrat [[Barack Obama]] received 57% of the vote, Republican [[John McCain]] received 41%, and each of the three state row office winners ([[Rob McCord]] for Treasurer, [[Jack Wagner (politician)|Jack Wagner]] for Auditor General, and [[Tom Corbett]] for Attorney General) also carried Allegheny. In 2016, despite [[Donald Trump]] being the first Republican to carry Pennsylvania since 1988, [[Hillary Clinton]] did slightly better than Barack Obama's 2012 vote total while Donald Trump was the worst performing Republican in 20 years. In the [[2018 United States elections|2018 Midterms]], Democrats received an even higher percentage of the vote with [[Tom Wolf]] and Casey receiving approximately two thirds of the county's vote.<ref>{{cite web|url=https://electionreturns.pa.gov/General/SummaryResults?ElectionID=63&ElectionType=G&IsActive=1|title=Pennsylvania Elections - Summary Results|website=electionreturns.pa.gov}}</ref><ref>{{cite web |url=https://electionreturns.pa.gov/General/SummaryResults?ElectionID=63&ElectionType=G&IsActive=0 |title=2018 General Election Official Returns |date=November 6, 2018 |publisher=Pennsylvania Department of State |access-date=October 3, 2019 }}</ref> This is an improvement over the approximately 55% each person received in the county in their last election in 2014 and 2012 respectively. In 2020, Joe Biden improved upon Clinton's performance, receiving the highest vote percentage for a Democrat since [[Michael Dukakis]] in 1988 and the most votes for a Democrat since [[Lyndon B. Johnson]] in 1964.

In the 21st century, populist turns to the GOP from nearly all of Appalachia in general and western Pennsylvania in particular have left the county as one of the few in the region that still supports the Democrats at a high level.