The decision in Bush v Gore is widely regarded as a landmark mistake, both because the Supreme Court acted politically and because of President Bush’s accomplishments and legacy.
While it is too recent for a historical consensus, and too political to be without controversy, virtually all liberals and progressives view the results of Bush v Gore, 2000, (Cornell Law School / Wikipedia) as disastrous based on the Bush Administration’s environmental, economic, and foreign policies, i.e., the Bush tax cuts, ignoring intelligence regarding Osama bin Laden on 6, August, 2011 (here), not killing bin Laden when we allegedly had him cornered in Tora Bora in 2001 (here), the War in Iraq, appointments of John Roberts and Samuel Alito to the Supreme Court, etc.