WASHINGTON (AP) — Republican president hopeful Newt Gingrich doubled down on his criticism of federal judges and the Supreme Court as chief rival Mitt Romney defended his record against likely Democratic attacks.

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With close to two weeks before GOP voters start choosing their nominee, Gingrich is courting the conservative primary voters he will need to win in Iowa and sustain his campaign against Romney, whose superior organization and pile of cash has him seeming ever more confident as he looks ahead to the general election.

"There is steady encroachment of secularism through the courts to redefine America as a nonreligious country and the encroachment of the courts on the president's commander-in-chief powers, which is enormously dangerous," Gingrich said Sunday on CBS's Face the Nation.

Polls in Iowa and nationally show Gingrich ahead of Romney in the race for the GOP nomination. Gingrich has acknowledged that Romney's repeated attacks have taken a toll on his campaign and is looking to stay at the top.

To do that, Gingrich is focusing on ideology as he courts the Iowa conservatives he needs to win the caucuses and challenge Romney's well-organized campaign in what could become a drawn-out primary.

Gingrich attacks courts, gets New Hampshire endorsement

He has mounted a broad attack on federal judges and the Supreme Court, arguing that they are legislating from the bench and have more control over the country than they should. It's an argument that drew sustained applause during a debate last week in Sioux City, Iowa — and one that could have particular resonance in a state where Republicans fought a protracted battle with state Supreme Court judges over gay marriage.

"The Manchester Union Leader which is a reliably conservative newspaper endorsed me and the Des Moines Register, which is a solidly liberal newspaper did not endorse me," Gingrich said Sunday. "I think that indicates who the conservative in this race is."

The Register, which typically has a left-leaning editorial board, endorsed Romney Saturday night.

The two Republican front-runners for the nomination focused on President Barack Obama and defending their own records in separate TV interviews. It was a shift from recent weeks where the two have attacked each other, trading accusations about each other's' records and the money each has made.

In a rare appearance on a Sunday news program, meanwhile, Romney portrayed himself as the GOP candidate who is best able to defeat Obama next year. Romney defended his years making millions in private business, claiming he'll be able to handle attacks from Democrats who are already trying to paint him as wealthy and out-of-touch. And he argued that his tax proposal is kinder to the middle class and less generous to the rich than the flat tax proposals his rivals — including Gingrich — are backing.

"The president's going to go after me," Romney said on Fox News Sunday. "I'll go after him."

On the next page: Which candidate is exciting voters the most?