This is the Reuters / Ipsos Poll. It was done between October 24th and 28th of random national sample of 676 Democrats and 584 Republicans. The margin of error for Democrats is 4.3 points, and for Republicans is 4.6 points.
It's not a lot different from the other recent polls. For Democrats, Hillary Clinton has majority support (53%) -- about 20 points ahead of Bernie Sanders (33%).
For Republicans, Donald Trump leads Ben Carson by 2 points (which is within the margin of error, and are the only candidates with double-digit support. Together they have the support of a majority of Republicans (56%).