WASHINGTON (AP) -- Mitt Romney said Wednesday he's "prepared to fight all the way" to become the Republican presidential nominee after padding his delegate count on Super Tuesday. Supporters of his chief rival, Rick Santorum, tried to elbow Newt Gingrich out of the race in an effort to give conservatives a clear alternative to the GOP front-runner.
Gingrich, who won only his home state of Georgia in Tuesday's balloting across 10 states, said Wednesday he's pressing ahead and will "wait and see how the race goes." He headed for Alabama and Mississippi, hoping to pick up more southern delegates next week.
Super Tuesday gave Romney a narrow victory in pivotal Ohio and wins in five other states, while Santorum laid claim to three states. Rep. Ron Paul won none. The split decision refreshed questions about Romney's appeal to conservatives, and guaranteed more convulsion ahead as Republicans struggle to settle on a candidate to take on President Barack Obama.
Leaders of a super political action committee supporting Santorum said it's time for Gingrich to step aside and let Santorum go head-to-head with Romney.
If Gingrich remains in the race "it's only a hindrance to a conservative alternative to Romney," said Stuart Roy, an adviser to the Red, White and Blue Fund. "And Romney simply won't be the conservative alternative to Obama."
The PAC has spent about $3 million on TV ads helping Santorum's White House bid, and Roy predicted that Wednesday would be "a good day for fundraising."
Santorum, who was campaigning Wednesday in Kansas and Mississippi, pointed to his wins in the West, the Midwest and the South as proof he can win across this country.
Romney, in an appearance on CNBC's "Squawk Box," insisted he's "getting the kind of support across the party that I need to become the nominee."
"We've got the time and the resources and a plan to get all the delegates, and we think that will get done before the convention," Romney said.
His campaign announced that Romney raised $11.5 million in February, the second-best month ever for the campaign. Still, that's not substantially ahead of Santorum, who raised $9 million in February.
Gingrich, in a morning appearance on Bill Bennett's "Morning in America" radio program, said there's no evidence Santorum could defeat Romney even in a one-on-one competition.
"If I thought he was a slam dunk to beat Romney and to beat Obama, I would really consider getting out," Gingrich said. "I don't."
Gingrich spokesman R.C. Hammond said Alabama and Mississippi, which vote on March 13, are must-win states for the former House speaker, although he stopped short of saying Gingrich would get out of the race if he lost there. To that end, Gingrich dropped plans to campaign Friday in Kansas, which holds caucuses Saturday, to focus on the southern states.
House Republican Leader Eric Cantor of Virginia argued that Romney's claim to the nomination is inevitable, adding that Santorum and Gingrich "have not demonstrated an ability to do what needs to be done." But in a morning interview on CBS "This Morning," Cantor acknowledged there is still plenty of ongoing debate in "a robust party with many ideas."
Obama chose the busiest day of the GOP race to speak from the presidential bully pulpit, where he dismissed the Republicans' almost constant criticism of his administration.
"Those folks don't have a lot of responsibilities," Obama said in a White House news conference. "They're not commander in chief."
In addition to claiming Ohio, Romney scored a home-state win in Massachusetts, and triumphs in Idaho, Vermont, Alaska, and Virginia. Santorum laid claim to Oklahoma, Tennessee and North Dakota.
Gingrich's win in Georgia, which he represented for several terms in Congress, was his first victory since he captured the South Carolina primary on Jan. 21.
Paul, the veteran congressman from Texas, had pinned his hopes on winning Idaho and Alaska but fell short in both.
Ohio was the marquee matchup, and for good reason. No Republican has won the presidency without carrying the state in the general election. It was a second industrial-state showdown in as many weeks between Romney and Santorum and drew the most campaigning and television advertisements of the 10 Super Tuesday states.
With 99 percent of Ohio precincts reporting, Romney had 38 percent to Santorum's 37 percent, an uncomfortably close margin for a candidate who had spent nearly four times as much money as his rival in the state.
In all, 419 delegates were at stake across the 10 states: Romney picked up at least 212; Santorum got 84, Gingrich 72 and Paul at least 22.
That gave the former Massachusetts governor 415, more than his three rivals combined. Santorum was second with 176, Gingrich had 105 and Paul had 47. It takes 1,144 delegates to win the nomination.
In Oklahoma, Democratic officials were reviewing party rules to determine if the president lost a delegate to anti-abortion activist Randall Terry, who got 18 percent of the vote in the Democratic primary. Obama got 57 of the Oklahoma vote, and the rest of the state's vote was fractured. Under party rules, Terry is eligible for a delegate since he got more than 15 percent of the statewide vote.
Until Tuesday, Obama had won all Democratic delegates awarded so far.