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With at least 1 in 3 New Hampshire voters undecided ahead of Tuesday's first-in-the-nation GOP presidential primary, back-to-back debates this weekend could provide opportunity for the emergence of a clear alternative to front-runner Mitt Romney.

The former governor of Massachusetts comes into Saturday night鈥檚 debate with a lead of at least 20 percentage points 鈥� and a target on his back.聽

So does former Sen. Rick Santorum of Pennsylvania, who in an 11th-hour surge fell nine votes short of winning the Iowa caucuses but who is only beginning to face the withering fire rivals dish out to front-runners. He can probably expect to see more of that in a nationally televised debate Saturday night and in a second matchup Sunday morning.

鈥淭he first rule in any debate is to do no harm,鈥� says Tom Rath, a senior Romney campaign adviser in New Hampshire. Mr. Romney, who has built his campaign around jobs and the economy, can be expected to stick to those themes.聽鈥淗e is not going to get an answer wrong,鈥� says Mr. Rath. 鈥淭his state knows him so well.鈥�

Mr. Santorum is just emerging on the radar screen of most voters here, despite making more than 100 visits to the Granite State in the runup to the primary.聽Having been drawn into spats with New Hampshire audiences over issues such as gay marriage, in this weekend's debates Santorum needs to avoid mistakes and convince conservatives, especially in upcoming primary states of South Carolina and Florida, that he is a credible alternative to Romney 鈥� and capable of holding his own against President Obama.

"There are going to be two debates in 16 hours," says Bill Cahill, cochairman of the Santorum campaign in New Hampshire. "In tonight's debate voters are going to see Rick Santorum, for the first time, in the center of the stage standing shoulder to shoulder with Mitt Romney. That's going to help a lot. He won't be at the edge of the stage, and people will pay more attention."聽

Saturday's debate begins at 9 p.m. Eastern time on ABC; it will stream live on聽.聽Sunday's takes place at 9 a.m., and it will be broadcast during local time slots for NBC's "Meet the Press." It will be livestreaming on聽.

Texas Gov. Rick Perry, who opted not to compete in the New Hampshire primary but will take part in the debates, this week unveiled an ad campaign slamming Santorum for spending on earmarks, or member projects, during his years in Congress.聽It鈥檚 a charge also leveled by GOP rival Ron Paul and Sen. John McCain, a two-time New Hampshire GOP primary winner and 2008 Republican presidential nominee, who endorsed Romney on Wednesday.

In a preview of likely exchanges in this weekend鈥檚 debates, Santorum defended his earmarks as a duty of any elected official to promote the interests of constituents.

鈥淚 represented the interests of the state of Pennsylvania,鈥� he said at a town-hall meeting in Dublin, N.H., on Friday. 鈥淭here are men and women who have an improved quality of life, and maybe are alive, because we did that.鈥�

Moreover, earmarks barely register as a cause of America鈥檚 soaring deficits. The key fight for fiscal conservatives is entitlement reform, Santorum adds. Once an untouchable "third rail" in American politics, Social Security reform is an issue he is eager to address in stops around the state. At a senior center in Brentwood, N.H., on Wednesday, Santorum told his audience that higher-income seniors could expect to see their benefits cut in a Santorum administration, in favor of helping younger workers.

In 1937, the poorest Americans were those over 65 years of age. Now, it鈥檚 younger workers, he said. 鈥淒o we say to younger workers that we鈥檙e going to tax you more to give a high income to seniors? I have a hard time seeing that is fair,鈥� he added. 鈥淚 think Franklin Roosevelt would have a hard time seeing that as fair.鈥�

In addition to taking the fight to Santorum and other GOP rivals, Governor Perry must avoid the gaffes and memory lapses in previous debates that have sunk his prospects.

Polling at No. 2 in New Hampshire, Congressman Paul, of Texas, is expected to reprise his attack ads on the 鈥渞ecord of betrayal鈥� of Santorum and former House Speaker Newt Gingrich, especially on their votes to expand government spending and raise the national debt limit. Paul says the debates are what have produced the 鈥渘ice crowds鈥� that follow him around the country, and that he doesn鈥檛 expect to do anything differently in these next two.

鈥淭he message is what counts,鈥� he told reporters as he landed at the Nashua, N.H., airport on Friday. 鈥淥f course I can always improve my ability to deliver the message, but good crowds make it easy for me.鈥�

Mr. Gingrich, the most formidable debater in GOP events to date, can be expected to take the fight over the future of the Republican Party straight to the front-runner, Romney.

鈥淭here will be a great debate in the Republican Party before we are prepared to have a great debate with Barack Obama,鈥� he said, after the Iowa caucus results dropped him from leader to No. 4. 聽

On Friday, Gingrich convened a 鈥淒on鈥檛 鈥楳ass up鈥� New Hampshire鈥� rally in Salem, N.H., in a bid to define Romney as a 鈥淢assachusetts moderate.鈥� After taking a drubbing from negative ads from Romney supporters and the Paul campaign in Iowa, Gingrich will come out swinging in Saturday night鈥檚 debate, some analysts predict. But Gingrich told the Monitor that 鈥渢elling the truth calmly鈥� is as far as he needs to go.

For Jon Huntsman Jr., former US ambassador to China and former Utah governor, the debates are one last shot at gaining some momentum in New Hampshire, where he has focused his efforts since shifting headquarters here at the end of September. A strong showing Tuesday is his only path to the presidency.

鈥淚 want your vote,鈥� he told a few hundred voters at town-hall meeting in Newport, N.H., on Friday. 鈥淲hen you ask someone for their vote, you ask for their trust鈥�. We鈥檝e got to begin a journey to get out of the hole we鈥檙e in.鈥�