Bernie Sanders continues to gain on Democratic presidential front-runner Hillary Clinton.

Among Democrats in Iowa, Clinton leads the independent Vermont senator 52 percent to 33 percent, according to a new Quinnipiac University poll. Though the former secretary of state still maintains a double-digit lead over Sanders, the lead has shrunk. In the last poll of Iowa Democrats, conducted in May, Clinton had a commanding lead of 60 percent to Sanders' 15 percent.

"[S]en. Sanders has more than doubled his showing and at 33 percent he certainly can't be ignored, especially with seven months until the actual voting. Iowa Democratic caucus-goers are generally considered more liberal than primary voters in most other states, a demographic that helps his insurgency against Secretary Clinton who is the choice of virtually the entire Democratic establishment," Peter A. Brown, assistant director of the Quinnipiac University Poll said.

The poll of roughly 800 likely Democratic Iowa caucus participants was conducted June 20-29 with a margin of error of plus or minus 3.6 percentage points.

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