Monmouth conducted the survey via landlines and cellphones from Aug. 19-22, surveying a random sample of 401 likely voters. The overall margin of error is plus or minus 4.9 percentage points.
Read more: http://www.politico.com/story/2016/08/poll-clinton-trump-missouri-227313#ixzz4IBAEP3Qv
Just thought I’d add that little tidbit re, the MOE.