Mitt Romney padded his delegate count on the biggest night of the GOP presidential primary season but Rick Santorum demonstrated enough strength to ensure that there's more convulsion ahead as Republicans struggle to settle on a candidate to take on President Barack Obama.

Republicans in 10 states weighed in on the GOP presidential nomination race in its busiest day yet. Mitt Romney won six states, Rick Santorum clinched three and Newt Gingrich prevailed in one. And along the way, clues were gleaned from the results about the path ahead. A look at what we learned:

Mitt Romney is declaring "I'm going to get this nomination" as Republicans in 10 states had contests to pick a challenger to President Barack Obama.

If Mitt Romney had one wish for the Republicans primaries ahead, it could easily be this: May all states be Massachusetts. His overwhelming win in the state where he served as the governor came across demographic and attitudinal groups. The difficulty ahead: it’s a state...

President Obama today rebuffed criticisms that he has been weak on Iran, accusing the Republicans vying to challenge him in the fall of “beating the drums of war” amid rising concerns about the prospect of Iran developing a nuclear weapon. “What’s said on the campaign...

President Barack Obama says Democrats will have a "better story" than Republicans to tell women voters in the November election.

President Barack Obama and the Republican presidential hopefuls clashed Tuesday over how to address Iran's nuclear program. The Republican contenders accused Obama of weakness, while Obama blasted back that presidents do not launch wars lightly.

President Barack Obama says Republicans on the presidential campaign trail display casualness about war when they urge military action to halt Iran's nuclear ambitions.

The ABC News politics and government teams will offer a live fact-check of President Obama’s first press conference of the year, which kicks off at 1:15 p.m. ET at the White House. Watch the press conference, which takes place as Republicans in ten states are...

Dan McLaughlin, Red State
It can be difficult to summarize in one place all of Mitt Romney’s problems as a candidate and as a potential President. I have tried; I wrote, back in 2007, a series so lengthy on Romney’s flaws (some 15,000 words, Part I, II, III, IV & V) that I can’t possibly hope to rewrite the whole thing now, and explained why I preferred McCain to Romney. More recently I focused on the dangers of backing Romney to the integrity of his supporters, the conservative movement’s need to maintain its independence from Romney, and the problems with...

“Super Tuesday” has been cast as a match between two main Republicans battling for the nomination, but the winner of the state with the most delegates to offer is probably going to be someone else: Newt Gingrich. Gingrich’s campaign has been written off a handful...

William McGurn, Wall Street Journal
Not since Herbert Hoover has a party out of power had such an opportunity to run against everything that troubles the American family—prices, interest rates, unemployment, taxes, or the fear for the future of their old age or the future of their children—than is now presented to the Republican Party. The Republicans, however, haven't figured this out. This is their basic problem. They have no strategy for defeating an Obama administration that is highly vulnerable on both domestic and foreign policy. ...

The Senate Republican leader said Monday the United States should use overwhelming military force against Iran if American intelligence finds that Tehran has decided to build a nuclear weapon or it has started to enrich uranium to weapons-grade level, a bold call certain to reverberate in U.S.-Israeli talks about how to deal with an emboldened Iran.

In a final day of campaigning before Super Tuesday, Republicans Mitt Romney and Rick Santorum focused on the economy in Ohio, the most sought after prize of the 10 states voting or caucusing. A week ago, Santorum had a substantial lead in Ohio polls; now he's in a statistical dead heat with Romney.

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AP - It's not a happy time for Republicans seeking the White House.

AP - Massachusetts Republicans are hoping that a big win for former Gov. Mitt Romney in the state's presidential primary could put Massachusetts, normally a lock for Democrats, up for grabs in November.

Reuters - Here are three safe bets on Virginia's presidential primary on Tuesday: Mitt Romney will win, turnout will be low and a lot of Republicans will be discouraged, which could help President Barack Obama in the battleground state in November.

Daily Caller - The Green Party is demanding that the Supreme Court declare the individual mandate included in President Barack Obama’s health care overhaul unconstitutional.

AP - House Majority Leader Eric Cantor says Republicans are coalescing around Mitt Romney's candidacy and looking for ways to work together to defeat President Barack Obama.

AP - Here, in a region rich with Republicans, GOP voters seem split between two camps. There are those delighted with Rick Santorum's emergence as an alternative to Mitt Romney and others who are struggling over whom to back in the party's volatile nomination fight.

Reuters - Here are three safe bets on Virginia's presidential primary on Tuesday: Mitt Romney will win, turnout will be low and a lot of Republicans will be discouraged, which could help President Barack Obama in the battleground state in November.

In July 2009, Mitt Romney called on President Obama to require Americans to buy insurance as part of his health care plan, using "tax penalties" as a backstop - in other words, the individual mandate that Republicans virulently oppose.

Politico - Losing your home state just doesn’t project an image of strength or likability.

AP - It wasn't so long ago that the Republican Party in Georgia was just an afterthought, and Democrats were in firm control of all the levers of state government. Back then, Newt Gingrich and other die-hard GOP stalwarts ventured across the state with the far-fetched message that Republicans could reverse the tide.