Republican and Republican-leaning independent college-graduate registered voters prefer Sen. Marco Rubio, R-Fla., as their preferred GOP presidential candidate.

College students, polled for an ABC and Washington Post poll, narrowly preferred Rubio with 13 percent, a small lead against Wisconsin Gov. Scott Walker's 12 percent. Former Florida Gov. Jeb Bush tied with neurosurgeon Ben Carson at 10 percent as Sen. Rand Paul, R-Ky., finished the top five with 9 percent.

In comparison to people with no college degree, Rubio's lead diminished. Paul, instead, placed first with 13 percent, while Bush and Walker tied for 11 percent. Former Arkansas Gov. Mike Huckabee is the only other GOP candidate to achieve double-digit figures with 10 percent. Rubio tied for fifth place with Sen. Ted Cruz, R-Fla., at 9 percent.

On the Democratic field, registered college graduate voters overwhelmingly preferred former Secretary of State Hillary Clinton with 57 percent. Sen. Bernie Sanders, I-Vt., placed second with 17 percent, narrowly ahead of Vice President Joe Biden's 14 percent.

With Democratic and Democratic-leaning registered voters, Clinton's percentage lead increased. She received 65 percent. Biden improved to 14 percent as Sanders slipped to 6 percent.

With Clinton as the top Democratic presidential choice, both Democratic and Republican college graduates were provided with hypothetical matchups. Between Clinton and Bush, the former secretary of state defeated the former Florida governor with 45 percent to 44 percent. Clinton's lead increased with post-graduate voters with 54 percent to Bush's 36 percent. Clinton also won with the 18-to-39-year-old age group, which includes millennials. Clinton received 55 percent, while Bush received 33 percent.

Regardless of education and age, Clinton still defeated Bush -- 49 percent to 41 percent respectively.

Most survey respondents believed Clinton would follow new policies rather than continue the agendas of President Barack Obama and Bill Clinton.

Despite Clinton scoring victories against Bush, more people said Clinton is not honest or trustworthy (52 percent to 41 percent). For the honest and trustworthy questionnaire, Bush attracted 45 percent to 40 percent in opposition.

"The decline in Clinton's ratings as a candidate who is honest and trustworthy highlights a likely vulnerability as a general-election candidate. Half of all Americans disapprove of the way she has handled questions about the Clinton Foundation, and 55 percent disapprove of how she has handled questions about her personal e-mails as secretary of state," wrote Dan Balz and Peyton Craighill of The Washington Post.

The ABC News and Washington Post national poll was conducted between May 28 and May 31. Abt-SRBI of New York conducted the poll.

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