Poll conducted February 21-23, 2018: Results are based on interviews with 428 randomly-selected registered voters in the state of New Hampshire. 

Poll conducted April 21-25, 2018: Results are based on interviews with 630 randomly-selected registered voters in the state of New Hampshire by landline and cellular phone.

Poll conducted August 15-18, 2018: Results are based on interviews with 817 randomly-selected likely primary voters in the state of New Hampshire by landline and cellular phone.

Poll conducted October 10-15, 2018: Results are based on interviews with 454 randomly-selected registered voters in the state of New Hampshire by landline and cellular phone.

Poll conducted April 3-8, 2019. Results are based on interviews with 698 randomly-selected registered voters in the state of New Hampshire by landline and cellular phone.

Poll conducted July 10-12, 2019. Results are based on interviews with 351 randomly-selected registered voters in the state of New Hampshire by landline and cellular phone.

Poll conducted September 25-29, 2019. Results are based on interviews with 423 registered New Hampshire voters expressing an interest to vote in the upcoming Democratic Presidential Primary Election by landline and cellular phone.

Poll conducted November 13-18, 2019. Results are based on interviews with 512 registered New Hampshire voters, including 255 who expressed interest in voting in the upcoming Democratic presidential primary election, by landline and cellular phone.

Poll conducted January 29-February 2, 2020. Results are based on interviews with 491 registered New Hampshire voters with an intention to vote in the Democratic presidential primary election conducted by landline and cellular phone.