Story highlights Donald Trump polls four times higher than Jeb Bush, a new Quinnipiac poll says

Bush is at his lowest rating since November 2013

Washington (CNN) Vice President Joe Biden fares better against top GOP candidates in hypothetical general election match-ups than Hillary Clinton, according to a new national survey.

The Quinnipiac University poll, released Thursday, also shows Donald Trump smashing the GOP presidential competition garnering 28% support from registered Republican voters in the 17-member field. The real estate mogul's closest competitor is retired neurosurgeon Ben Carson, who tallies 12%.

Just 7% said they would vote for former Florida Gov. Jeb Bush, a record low since November 2013.

Those results show just how far both Trump -- now the Republican front-runner -- and Bush -- the old one -- have come. Bush led national polls for much of the first half of 2015, but was quickly dislodged by Trump, after he announced his presidential ambitions this June.

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