Look at the link. Always go to the source, not the excerpt. As we know from scientific abstracts, excerpts often lie.
The poll was conducted online Dec. 28-Jan. 3, surveying 3,181 registered voters among a sample of 3,700. The margin of error for 949 registered Republican voters is plus or minus 3.7 percentage points, while among 1,060 Democrats the margin of error is plus or minus 3.3 percentage points.
bold my emphasis