New polls reveal race for the White House scrambled once again

WASHINGTON, D.C. -- The race for the White House is getting scrambled once again. A series of new polls shows Hillary Clinton losing ground on the Democratic side and an unexpected contender surging on the Republican side.

A new poll from the Des Moines Register shows Democratic support for Hillary Clinton has shrunk by 20 points since May, from 57 percent to 37 percent. Vermont Sen. Bernie Sanders is now right on her heels at 30 percent. And Vice President Joe Biden stands at 14 percent, even though he hasn't decided if he's running.

Democratic presidential nomination race tightens in Iowa

Another new Iowa poll, from Monmouth University, shows two non-politicians are now dominating the GOP field.

Neurosurgeon Ben Carson has pulled even at 23 percent with businessman Donald Trump.

"I had an incredible medical career," Carson said. "God blessed me and my wife, we were planning to sit back and relax."

Carson, 63, has been quietly climbing in the polls.

Democratic race tightens in Iowa while Trump support soars

He's also one of the few Republicans who hasn't had to fend off one of Trump's trademark attacks.

"Jeb's funding is drying up," Trump said last week. "You know why? It's because he's losing so badly."

In fact, Carson spends little time attacking anyone. Supporters at a recent Colorado event said that's why they like him.

"He is saying the same things that Donald Trump is saying, but he's a kind, gentle soul," said one supporter.

Carson's favorability rating in the Iowa Poll was an eye-popping 81 percent -- the highest in the GOP field. But even Trump, a once-polarizing figure, is now viewed favorably by more than 50 percent of Republican voters there.

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    Nancy Cordes is CBS News' congressional correspondent.