(CNN) Vermont Sen. Bernie Sanders tops the Democratic primary race, according to a new Quinnipiac national poll released on Monday.

Sanders, with 25% support among Democrats and Democratic-leaning independent voters, has ticked up four percentage points since a late January poll from Quinnipiac, while other candidates have lost support.

While Biden is down nine percentage points since January, Bloomberg has seen significant growth, up 7 percentage points -- nearly doubling his 8% support.

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