21.   The CBS poll had an error margin of four percentage points.

22.   The error margin in both polls was three percent.

23.   The error margin was plus or minus three percent.

24.   The error margin was three percent.

25.   The error margin was two percent either way.

26.   The error margin in the polls is three percent.

27.   The error margin was three percent either way.

28.   The error margin was three percentage points.

29.   The poll has an error margin of four percentage points.

30.   The poll had an error margin of about five percentage points.