A bit of background... GOP Presidential Primary national polling features former President Donald Trump and former UN Secretary Nikki Haley. The polling indicator of the party's direction and the preferences of its base. These national averages become more important as primary elections occur more frequently.

The polling bias for the 2016 and 2020 Presidential elections is based on analysis from the American Association of Public Opinion Research (AAPOR) comparing actual results to national polls. For the 2018 and 2022 elections, bias was measured by comparing FiveThirtyEight's Generic Ballot polling average with the adjusted US House National Popular vote, using data from the UVA Center for Politics (2018) and DecisionDeskHQ (2022).