Democrats could win Mississippi in this fall's presidential election for the first time in 40 years, according to a new poll.

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Trump has 46 percent support, while Clinton pulls in 43 percent — within the margin of error of 4 percentage points.

The last time a Democrat won Mississippi was 1976, when Jimmy Carter defeated Gerald Ford.

Republican presidential candidate Mitt Romney beat President Obama in Mississippi in 2012 by 12 points.

Clinton is closing the gap on Trump primarily because of his weakness among women voters.

Clinton takes 47 percent support among women, with Trump at 40 percent. She also attracted 15 percent of the vote from white Republican women, the poll found.

The Mason-Dixon survey is the latest poll to show Trump performing poorly in a match-up against Clinton.

In national surveys, Clinton leads Trump by nearly 11 points, according to a RealClearPolitics average.

In Mississippi, Cruz leads Clinton 51 to 40 percent, while Kasich leads her 52 to 37 percent, the poll found.

Trump easily won the Mississippi GOP primary last month, taking 47 percent of the vote, with Cruz in second at 36 percent.

The poll found Clinton would take 93 percent support from black voters in Mississippi, and Trump only 3 percent.

The Mason-Dixon survey of 625 registered voters in Mississippi was conducted March 28–30 and has a margin of error of 4 percentage points.