John Pemble/IPR file

Democratic presidential candidate and Vermont U.S. Senator Bernie Sanders leads rival Hillary Clinton by one point among Iowa caucus-goers, in a poll released this morning by Quinnipiac University.  It found 41-percent of likely Democratic participants back Sanders, while 40-percent chose former Secretary of State Clinton. 

The poll has a margin of error of plus-or-minus 3.4 percentage points.