Donald Trump still rates as the GOP's 2016 presidential front-runner, though a stream of recent Republican Party polls suggest that support for the billionaire real estate mogul may be leveling off.

CNN reports a recent Quinnipac University national survey of likely republican voters finds support for Trump at 25 percent, with Ben Carson checking in at 17 percent and Carly Fiorina at 12 percent.

Former Florida Gov. Jeb Bush rounds out the four GOP candidates now at least registering in double-digits with 10 percent, followed by Florida Sen. Marco Rubio at 9 percent and Texas Sen. Ted Cruz at 7 percent.

Earlier in the week, a CNN/ORC poll also found Fiorina closing in on Trump following her strong showing during a recent party debate that was viewed by more than 23 million people.

In that poll, Trump stood at 24 percent, down some eight points from roughly just a week before, and Fiorina and Carson at 15 and 14 percent respectively.

On the Democratic side, the Quinnipac poll found Hillary Clinton still holds a commanding 18-point lead over Sen. Bernie Sanders. Overall, Clinton polls at 43 percent to Sanders' 25 percent. Current vice president Joe Biden, who hasn't officially announced that he will be a candidate, checks in at 18 percent.

With Biden taken out of the mix, Clinton's numbers rise to 53 percent, while Sanders picks up a modest five points to 30 percent.

When it comes to potential general election match-ups, Carson is the lone republican candidate to top Clinton, registering with 49 percent of the vote to her 42 percent. The former Secretary of State and Democratic front-runner runs even with all three of the other top republican candidates.

In addition, CBS reports a recent WMUR/CNN New Hampshire poll finds that Trump's support in that key battleground state has also grown stagnant and he now leads the surging Fiorina by just 10 points (26 to 16), followed by Rubio at nine percent.

Among the Democratic voters in that state, Sanders registers 46 percent of the vote and tops Clinton by 16 points.