The chart above reflects the results of the USA Today / Suffolk University Poll -- done between August 25th and 28th of a nationwide sample of 1,000 registered voters, with a 3.1 point margin of error.
The chart above shows the results of the Quinnipiac University Poll -- done between August 23rd and 27th of a nationwide sample of 1,611 likely voters, with a 2.4 point margin of error.