Eleven counties that may overturn the election. Their votes in 2012, 2016 and (so far) in 2020.

County          2020  Biden     Trump      %B  %T

                       2016  Clinton   Trump     %C   %T

                       2012  Obama   Romney    %O  %R

Philadelphia 2020 594,005 131,330 81.4% 18%

                       2016 584,025 108,748 82.3% 15.3% 

                       2012 557,024   91,840 85.2% 14.1%

Allegheny      2020 428,876   282,170 59.6% 39.2%

(Pittsburgh)  2016 357,167  259,480  55.9%  39.5%

                        2012 348,151  259,304  56.6%  42.2%

Maricopa co 2020 1.040,774 995,665  50.3% 48.1%

(Phoenix, AZ) 2016 702,907  747,361  44.8%  47,7%

                         2012  532,284 680.089  43.2% 55.1%

Wayne Co       2020  587,074 264,149  68.1%  30.7%

(Detroit)         2016   519,444 228,993  66.4%  29.3%

                         2012   595,253  213,586 73.1%  26.2%

Kent CO           2020  186,753  165.318  52%     46%

(Grand Rapids) 2016 138,683  148,180  44.6% 47.7%

                          2012   134,560  157,801  45.5% 53.4%

Milwaukee co 2020  317,270   134,357  69.4% 29.4%

Wisconsin        2016    288,822 128,069  65.5% 28.6%

                           2012   328,090  158,430  66.8% 32.3%

Dane Co            2020  260,185    78,800  75.7%  22.9%

(Madison)         2016  217,697    71,275   70.4% 23.0%

                           2012   215,389    83,459   71.1%  27.6%

Clark Co            2020   521,852  430,930  53.7%  44.3%

(Las Vegas)       2016   402,227  320,057  52.4%  41.7%

                           2012   387,978  288,223  56.4%  41.9%

Fulton Co          2020  381,144   137,240  72,6%  26.2%

(Atlanta)           2016  297,051  117,783  67.7%  26.8%

                           2012   248,479  133,837   64.2%  34.6%

DeKalb Co         2020   308,140   58,369    83.1%  15.7%

                            2016   251,370   51,469   79.1%   16.2%

                            2012    237,704    64.308  77.9%  21.1%

Gwinnett Co      2020   241,827  166,413  58.4%  40.2%

                            2016   166,153  146,989   50.2%  44.4%

                            2012    131,879  159,563  44.6%  54%