Former Republican presidential nominee Mitt Romney speaks at a campaign rally with Republican candidate for the United States Senate Scott Brown at Gilchrist Metal Fabricating in Hudson, New Hampshire October 15, 2014. REUTERS/Brian Snyder

WASHINGTON (Reuters) - Mitt Romney, the Republican Party's unsuccessful presidential nominee in 2012, leads the field for the 2016 election among Republican voters, according to a Quinnipiac University poll released on Wednesday.

The former Massachusetts governor would have a slight edge over potential Democratic candidate Hillary Clinton by 45 percent to 44 percent in a general election, the poll found.

Among possible Republican candidates, Romney's 19 percent put him ahead of former Florida governor Jeb Bush with 11 percent, New Jersey Governor Chris Christie and Ben Carson each with 8 percent each, and U.S. Senator Rand Paul of Kentucky with 6 percent.

Carson, a former neurosurgeon with no political experience, is a conservative commentator and author of "One Nation," which topped the New York Times best-seller list in June.

U.S. Representative Paul Ryan of Wisconsin, U.S. Senator Ted Cruz of Texas, Wisconsin Governor Scott Walker and former Arkansas governor Mike Huckabee all had 5 percent, while 16 percent of those questioned were undecided.

With Romney out of the picture, Bush polled 14 percent with Christie at 11 percent and Carson at 9 percent.

Clinton, the former secretary of state, dominated the field for Democratic voters in the poll with 57 percent, followed by U.S. Senator Elizabeth Warren of Massachusetts with 13 percent and Vice President Joe Biden with 9 percent.

The telephone poll, taken Nov. 18-23, questioned 707 Republicans and 610 Democrats with a margin of error of about 4 percentage points.

(Writing by Bill Trott; Editing by Jeffrey Benkoe)