Maybe not. Here's Joe Klein, on the weekend's GOP action:

I watched tonight's debate with the Frank Luntz focus group at the famed Merrimack Diner, while about 50 Ron Paul supporters--angry that their guy hadn't been included--ranted and raved outside. I"m not sure this was a representative group of Republicans. They seemed pretty conservative. And they...Just. Loved. Romney. Most of those who came in undecided had switched to Mitt by the end of the show. They just adored his position on illegal immigration (their dials plummeted when McCain said we had to be "humane.") They loved his explanation of why he had switched his position on abortion. They loved it when he nailed Huckabee as a tax fact, Huckabee's failure to acknowledge that he was a net raiser of taxes ended his credibility with the audience (which, since this is New Hampshire, had been wary of his flagrant religiosity from the start).

Meanwhile, McCain was nowhere. His answers lacked zing. He seemed tired. He was unable to make a vigorous case for himself as a leader--even his references back to his days in the military didn't cut it with this Republican audience. McCain won here in 2000 because independent voters found him far more compelling than the independent alternative on the Democratic side, Bill Bradley. This time, he's competing with Barack Obama for independents in a state decidedly more blue than it was in 2000...He may still have enough heft to win this thing. But I wouldn't be surprised to see the race tighten or swing toward Romney over the next few days.

I still expect McCain to win New Hampshire; I can't imagine that four days of campaigning, even with two debates crammed in, will be enough time for Romney to shift the polls back into his favor. But I think McCain had an opportunity, with Romney hurt by Iowa, Huckabee hurt by being Huckabee, and Thompson and Rudy seemingly out of the running, to seize the mantle of GOP frontrunner this week, and consign Romney's campaign to near-oblivion. After watching the debates, which highlighted McCain's weaknesses as a candidate for the Republican nomination rather than his strengths, I don't think that's going to happen. Even if McCain takes New Hampshire, I don't think this race will be any less wide-open going into Michigan and South Carolina than it is today.
