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

NBC News/WSJ/Marist Iowa 2016 Democratic Caucus Poll

• Hillary Clinton 33% (38%) {49%} [68%] (70%)
• Bernie Sanders 28% (27%) {25%} [7%]
• Joe Biden 22% (20%) {10%} [12%] (20%)
• Martin O'Malley 3% (4%) {3%} [0%]
• Jim Webb 1% (2%) {1%} [1%]
• Lincoln Chafee 0% (1%) {0%}
• Undecided 12% (8%) {11%} [12%] (10%)

If Joe Biden does not run:

• Hillary Clinton 47% (48%) {55%}
• Bernie Sanders 36% (37%) {26%}
• Martin O'Malley 4% (4%) {4%}
• Jim Webb 1% (2%) {2%}
• Lincoln Chafee 0% (1%) {1%}
• Undecided 13% (8%) {13%}

Survey of 348 potential Democratic caucus-goers was conducted September 23-30, 2015.  The margin of error is +/- 5.3 percentage points. Results from the poll conducted August 26 - September 2, 2015 are in parentheses. 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.