By Jim Ellis

Neck-and-neck polling in a few key battleground states between President Donald Trump and former vice president Joe Biden shows interesting parallels to the 2016 race between Trump and Hillary Clinton.
The conventional wisdom and preponderance of polling trends suggest that Joe Biden is leading the presidential race, but that President Trump is making a comeback, and the race is beginning to show some of the same characteristics found in 2016.
Three of the key states that baffled the political pollsters four years ago were Michigan, Pennsylvania, and Wisconsin. As we will remember, President Trump was expected to lose them all but scored close upset victories in each place.
The aggregate group of 2016 pollsters missed in each of the three states and the Real Clear Politics polling archives still publicly maintains all of those survey results. Therefore, we have the historical data to draw clear parallels between then and now.
In Wisconsin, 33 polls were taken during the election cycle and only one, from the Trafalgar Group at the end of the campaign season, placed Trump in front. A total of 62 polls were conducted in Pennsylvania with only three, again including a Trafalgar poll, projecting the future president into the lead. In Michigan, 42 polls were publicly released with Trump ahead in just two.
Though it is not generally statistically significant to average polling results because the polling methodologies, and certainly sample sizes, are very different, doing so does give us a guide as to the error factor that was present in 2016, and possibly a glimpse into what might exist this year.
In Wisconsin, the average Hillary Clinton lead advancing into the general election was 6.5 percentage points. With a 0.7 percent win for Trump, the overall error factor became a whopping 7.2 percent. The Pennsylvania numbers were closer but still a significant miss. Clinton’s average lead heading into Election Day was 2.1 percent and the president won there by the same 0.7 percent that he carried Wisconsin. Therefore, the Keystone State error factor was 2.8. Michigan was a similar story. Error factor: Clinton plus-3.6 percent. Trump victory margin: just 0.3. Total Michigan error factor: 3.9.


May 8, 2020 — The Silver State of Nevada, with six Electoral College votes, has been regarded as a swing state in most 21st Century presidential elections, but in projecting the 2020 vote, it is routinely considered as a place destined to land in the Democratic column. But, could Nevada ultimately be in play for President Trump?

April 20, 2020 — Within a 10-day period, two statewide polls producing radically different results were conducted of the North Carolina electorate. Rather unsurprisingly, the Republican polling firm turned in better results for the GOP candidates than did the Democratic company.
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