Rep. Paul RyanPaul RyanTrump delivers ultimatum to GOP on ObamaCare repeal Dem senator to reintroduce ‘buy American’ legislation Paul: Pence should oversee Senate ObamaCare repeal votes MORE (R-Wis.) and former secretary of State Hillary ClintonHillary Rodham ClintonNew England Patriots to visit White House on April 19 More than ever, Justice must demand a special prosecutor for Trump-Russia probe White House scoffs at CNN report on alleged Russian collusion 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 PaulPaul: Pence should oversee Senate ObamaCare repeal votes Healthcare fight pits Trump against Club for Growth GOP rep: Trump could be 'one-term president' if healthcare bill passes MORE (Ky.), Gov. Scott Walker (Wis.), Sen. Marco RubioMarco RubioSenators introduce new Iran sanctions Senate intel panel has not seen Nunes surveillance documents: lawmakers With no emerging leaders, no clear message, Democrats flounder MORE (Fla) and Sen. Ted CruzTed CruzPaul: Pence should oversee Senate ObamaCare repeal votes Senators introduce new Iran sanctions With no emerging leaders, no clear message, Democrats flounder 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 BidenBiden: 'McCain is right: Need select committee' for Russia With no emerging leaders, no clear message, Democrats flounder Obama defends healthcare law on eve of repeal vote MORE placed second in the Iowa Poll, followed by and Gov. Martin O’Malley (Md.) and former Gov. Brian Schweitzer (Mont.).