(CNN) - The new Des Moines Register survey makes one thing clear: Iowa Republicans don't think their favorite potential candidate for the GOP presidential nomination in 2016 could win a national election.
The poll ranked GOP Rep. Paul Ryan of Wisconsin, the 2012 Republican vice presidential nominee and chairman of the powerful House Budget Committee, first in favorability among 11 Republicans considering bids for the GOP nomination.
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But, when it comes to who they think has the best chance to win the presidency in November 2016, establishment favorites New Jersey Gov. Chris Christie and former Florida Gov. Jeb Bush - the two men with the highest unfavorable ratings - come out on top.
While Christie and Bush may represent two of the more unsavory options for conservatives, the response to the poll from Iowa conservatives indicates they have a perceived edge on electability. Nineteen percent of those surveyed said Christie stands the best chance of beating the Democratic nominee at the polls, with 16% saying Bush would be the most likely to return Republicans to the Oval Office.
Despite his high favorability - 56%of those surveyed said they had a very favorable or mostly favorable opinion of the fiscal hawk, Ryan slides down the rankings on the question of electability. Only 13% of Iowa Republicans surveyed believe Ryan would be the best choice to take back the White House, tied with Texas governor Rick Perry.
Former Arkansas Gov. Mike Huckabee, a 2008 Republican presidential candidate, had the second highest favorable rating, at 50%, with Texas Gov. Rick Perry, who ran for the 2012 nomination, at 49%. Perry visited the Hawkeye State just ten days ago, while the poll was in the field.
Huckabee and Republican Sen. Rand Paul of Kentucky, finished tied for third on the electability question, each with 13 percent.
The Des Moines Register poll was conducted May 27-30, with 400 Republicans who said they were likely to vote in Iowa's June 3 GOP primary questioned by phone. The survey's sampling error is plus or minus 4.9 percentage points.