Sanders outperforms Clinton in general-election matchups
The NBC/WSJ/Marist polls also show that Sanders outperforms Clinton in hypothetical general-election matchups in these two presidential battleground states - something other surveys have found, too.
In Iowa:Clinton leads Trump by eight points among registered voters (48 percent to 40 percent), but Sanders is ahead of him by 13 (51 percent to 38 percent);
Cruz tops Clinton by four points (47 percent to 43 percent), but Sanders beats him by five (47 percent to 42 percent);
And up Rubio is up by five points over Clinton (47 percent to 42 percent), while he's tied with Sanders (44 percent to 44 percent).
In New Hampshire:Clinton is ahead of Trump by just one point (45 percent to 44 percent), but Sanders tops him by 19 points (56 percent to 37 percent);
Cruz beats Clinton by four points (48 percent to 44 percent), but Sanders leads him by another 19 points (55 percent to 36 percent);
And Rubio bests Clinton by 12 points (52 percent to 40 percent), while Sanders leads him by nine points (50 percent to 41 percent).
The primary reason why Sanders tests better in these general-election matchups is due to his stronger performance with independent voters.
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http://www.nbcnews.com/meet-the-press/poll-neck-neck-2016-races-iowa-new-hampshire-n493361