Rep. Paul RyanPaul RyanGOP leaders launch internal review into leak Opinion | Michael Steele: Gianforte better put his ‘big boy’ pants on Washington needs high-level science and technology expertise – now! MORE (R-Wis.) and former secretary of State Hillary ClintonHillary Rodham ClintonClinton: ‘I don’t die’ despite the right’s ‘best efforts’ Clinton: Comey firing is ‘an effort to derail and bury’ Russia probe RNC slams Clinton speech as example of 'why she lost' MORE (D) are the early favorites of Iowa voters among possible 2016 presidential candidates, according to a new Des Moines Register Iowa Poll.

Seventy-three percent of Republican Iowa adults viewed the Ryan very or mostly favorably, while 10 percent viewed the 2012 GOP vice presidential nominee very or mostly unfavorably.

Ryan last week reached a budget agreement with Sen. Patty Murray (D-Wash.) that, despite conservative criticism, passed the House in a 332-94 vote.

Former Gov. Mike Huckabee (Ark.) placed second among possible Republican candidates in the Iowa Poll.

The winner of the 2008 Iowa caucuses is conducting polling and gauging support for a possible 2016 presidential bid.

“I’m keeping the door open,” he told The New York Times last week. “I think right now the focus needs to be on 2014, but I’m mindful of the fact that there’s a real opportunity for me.”

Huckabee is followed by former Sen. Rick Santorum (Pa.), Gov. Rick Perry (Texas), former Gov. Jeb Bush (Fla.), Gov. Chris Christie (N.J.), Sen. Rand PaulRand PaulSenate gears up for fight on Trump's 0B Saudi Arabia arms sale Paul: 0B Saudi arms deal ‘a travesty’ Senate feels pressure for summer healthcare vote MORE (Ky.), Gov. Scott Walker (Wis.), Sen. Marco RubioMarco RubioSenate panel could pass new Russia sanctions this summer McConnell on Trump: 'We could do with a little less drama' Taking the easy layup: Why brain cancer patients depend on it MORE (Fla) and Sen. Ted CruzTed CruzFEC faults Cruz on Goldman Sachs loans in rare unanimous vote CBO score underlines GOP tensions on ObamaCare repeal Republicans go to battle over pre-existing conditions MORE (Texas).

Among Iowa Democrats, an “eye-popping” 89 percent of Democrats rated Clinton as very or mostly favorable, compared with 7 percent who viewed her very or mostly unfavorably.

“Clinton’s score is eye-popping and shows she is viewed more favorably than any Democrat or Republican by a big margin,” said Jeff Link, an Iowa Democratic operative, told the Register.

Vice President Joe BidenJoe BidenThe Hill's 12:30 Report Cornell unveils Biden ice cream Biden fuels 2020 speculation MORE placed second in the Iowa Poll, followed by and Gov. Martin O’Malley (Md.) and former Gov. Brian Schweitzer (Mont.).