DES MOINES – As GOP presidential hopefuls jostled for the conservative vote in Iowa Saturday, Texas Sen. Ted Cruz stood out with a warning: “Talk is cheap.”

The Republican phenom — who has alienated some GOP colleagues in DC — riled up the state’s social conservatives by calling on America to “repeal every word of ObamaCare” and “abolish the IRS.”

“In a Republican primary every candidate is going to come in front of you and say I’m the most conservative guy that ever lived,” Cruz said to a crowd at the Iowa Freedom Summit.

“You know what, talk is cheap,” he said, adding, “Look every candidate in the eye and say ‘Don’t talk, show me.’”

Cruz was one of two dozen GOP speakers and White House contenders flocking to the heartland summit, where they took potshots at Democrats — and each other.

Wisconsin Gov. Scott Walker — fresh off his re-election — wooed the crowd by firing off a litany of lines that brought activists to their feet during the event hosted by Iowa Rep. Steve King.

“We need a president who doesn’t sit in Washington, DC, when world leaders are standing together against terrorism in Paris,” Walker said, blasting President Obama for failing to march after the terror attacks there.

Walker claimed he has received death threats over his union-busting policies and said it “reminded me to focus on why I ran for governor in the first place.”

New Jersey Gov. Chris Christie worked to sway Iowans skeptical of whether he fits the bill for a presidential front-runner in the conservative state. It was his 11th visit to Iowa in five years.

“If I was too blunt, too direct, too loud and too New Jersey for Iowa, then why do you people keep inviting me back?”

Christie promised voters, “you’ll always know who I am,” and spoke about his anti-abortion views.

“The rich are doing fine,” he said, adding the party shouldn’t cater to the wealthy at the expense of middle-income workers.

Sarah Palin, a 2008 vice presidential nominee, delivered a meandering speech that covered a controversy involving her son stepping on the family dog and Islamic terrorists.

She also condemned Hillary Clinton, who will likely be a Democratic contender. “Hey Iowa, can anyone stop Hillary?” Palin said. “Let’s borrow a phrase, ‘Yes we can.’ It starts here and it starts now.”

Former Pennsylvania Sen. Rick Santorum, who narrowly won Iowa caucuses in 2012, received tepid applause.

Santorum called on Iowans to make their own choice and not select someone “who Washington and New York think would have the best chance.”

He said the GOP needs “to be on the side of the American worker” and end corporate welfare if it’s going to cut social programs.

Dr. Benjamin Carson, little-known but a darling among conservatives, called for slashing the federal payroll through attrition.

The retired neurosurgeon also pitched a Canadian-style guest-worker program that would require illegal immigrants to leave to reapply to work here.

“Why would I be in favor of people obliterating people’s lives?” Carson asked, to cheers.

Donald Trump laced into most of the GOP field. In remarks to reporters, Trump skewered 2012 presidential nomineeMitt Romney, who was not scheduled to appear. “You don’t want to give a choker a second chance,” he said.