On Tuesday March 6, 11 states across the country -- Alaska, Georgia, Idaho, Massachusetts, North Dakota, Ohio, Oklahoma, Tennessee, Vermont, Virginia, and Wyoming -- will hold contests that will award a combined 424 delegates. That’s more than any other one day this Republican primary season. Up until now, there have been 12 contests (in some form or fashion), with Mitt Romney winning seven of them, Rick Santorum four, Newt Gingrich one, and Ron Paul zero. NBC’s current delegate count stands at Romney 119, Gingrich 30, Santorum 17, Paul 8.

The GOP presidential candidates have different strategies and strongholds in these 11 contests. Romney hopes to lock down his home state of Massachusetts, Vermont, and Virginia (where only he and Paul are on the ballot). Santorum is expecting wins in Oklahoma and Tennessee. Gingrich has focused on his home state of Georgia. And Paul has concentrated on the caucuses in Alaska, Idaho, and North Dakota. The biggest prize is Ohio, where all the candidates -- except for Paul -- have campaigned. But more than anything else, Super Tuesday is a math race: Which candidate can rack up the most delegates from these 11 states? Note that many of these contests award delegates proportionally, so a second-place (or even third place) finish can get you delegates.

Click here to read the NBC News Super Tuesday Guide, complete with analysis of the candidates’ strategies, ad spending, candidate travel, history of Super Tuesday – when and why they’ve mattered, and a complete state-by-state breakdown of the delegates at stake, rules, procedures, poll opening and closing times, and full results so far.

FARGO, ND — Opening a new front against President Obama in oil-rich North Dakota today, Mitt Romney argued that president Obama deserved “no credit” for increases in domestic oil production, and said the president should be “hanging his head” over the state of American energy.

“So far from taking credit, he should be hanging his head and taking a little bit of the blame for what's going on today,” Romney told a town hall audience of about 200 Fargoans gathered for a town-hall style event.

“He's cut the lease rate [for exploration on federal lands] in half - and how about giving permits to drillers? He's cut that rate of permitting down to one third. This is a president who's not been helping the situation,” Romney said.

Hours after Romney spoke here, President Obama delivered his own energy-related address in New Hampshire.

Romney also took the president to task for pushing to regulate hydraulic fracturing of oil and gas wells, an extraction technique commonly known as “fracking,” at the federal, rather than state level, saying such a move would “stifle” domestic oil production.

Fracking consists of injecting hundreds of thousands of gallons of a mixture of water, sand and chemicals into oil and gas wells at high pressure to fracture rock and release oil and gas within. The technique, by no means new, has earned the attention of environmentalists in recent years, who fear chemical spills or contamination of local supplies and aquifers, particularly in formations near major population centers like the Marcellus shale in Pennsylvania, New York and Ohio.

Romney’s comments received a warm reception here, where horizontal drilling techniques, rising oil and gas prices and an expansion in fracturing in the Bakken shale formation beneath North Dakota has led to a jobs boom, and the lowest unemployment rate in the nation at 3.3%. Employers have struggled here to find qualified truck drivers, roughnecks and engineers, and so-called “man-camps” have sprung up across the state to accommodate workers from other states swarming to North Dakota for jobs linked to the oil and gas industry.

“If you've got a clean record, and you can drive a truck, you're making minimum $60,000," state representative Bette Grande told NBC before the event.

“You're not going to find a hotel room, that’s for sure," Grande added, explaining that the state has been simply unable to keep up with the infrastructure needs of a booming oil-and-gas economy. Roads strain under tractor-trailer traffic, and housing remains a constant need.

For his own energy policy, he former Massachusetts governor described something of a “kitchen sink” approach that would include increased domestic coal and oil production (including offshore and in ANWAR), approval of the Keystone pipeline, and greater reliance on nuclear power, as well as alternative sources of energy.

“I like wind and solar... but they're not going to drive our cars,” Romney said.