The Quinnipiac University Poll was done between May 16th and 20th of a national sample of 1,078 voters, with a 3.7 point margin of error.
The Economist / YouGov Poll was done between May 18th and 21st of a national sample of 1,500 adults, with a 2.7 point margin of error.
The Politico / Morning Consult Poll was done between May 17th and 19th of a national sample of 1,995 registered voters, with a 2 point margin of error.
