Poll Watch: Gravis Marketing (R) Iowa 2016 Democratic Caucus Survey

Gravis Marketing (R) Iowa 2016 Democratic Caucus Poll 

• Hillary Clinton 49% (39.5%) {45.1%} [50.8%] (59%)
• Bernie Sanders 31% (30.6%) {16.9%} [24.0%] (15%)
• Martin O'Malley 10% (1.5%) {4.9%} [4.7%] (3%)  

Survey of 418 Democratic caucus participants was conducted December 18-21, 2015. The margin of error is +/- 5 percentage points. Results from the poll released October 1, 2015 are in parentheses. Results from the poll conducted August 29-31, 2015 are in curly brackets. Results from the poll conducted July 29, 2015 are in square brackets. Results from the poll conducted May 28-29, 2015 are in parentheses.