Poll Watch: NBC News/Marist Iowa 2016 Democratic Caucus Survey

NBC News/Marist Iowa 2016 Democratic Caucus Poll

• Hillary Clinton 38% {49%} [68%] (70%)
• Bernie Sanders 27% {25%} [7%]
• Joe Biden 20% {10%} [12%] (20%)
• Martin O'Malley 4% {3%} [0%]
• Jim Webb 2% {1%} [1%]
• Lincoln Chafee 1% {0%}
• Undecided 8% {11%} [12%] (10%)

If Joe Biden does not run:

• Hillary Clinton 48% {55%}
• Bernie Sanders 37% {26%}
• Martin O'Malley 4% {4%}
• Jim Webb 2% {2%}
• Lincoln Chafee 1% {1%}
• Undecided 8% {13%}

Survey of 345 potential Democratic caucus-goers was conducted August 26 - September 2, 2015.  The margin of error is +/- 5.3 percentage points. Results from the poll conducted July 14-21, 2015 are in curly brackets. Results from the poll conducted February 3-10, 2015 are in square brackets. Results from the poll conducted July 7-13, 2014 are in parentheses.