A strange quirk of the New Hampshire primary - this year a wholly Republican affair - is that it is a semi-open primary, and one in which write-in candidates are permitted, and in which delegates are allocated proportionately, instead of winner-take-all. In theory, if enough Independents (or even Republicans) could be persuaded to write in Barack Obama, he could actually win a delegate or two.
In the 2000 New Hampshire primary, the Democratic contest was between Al Gore and Bill Bradley. Gore won with about 76,000 votes to Bradley's 70,000, and the delegates were split accordingly, 13 to 9. But, flying a bit under the radar, over 3,000 write-in ballots were cast in the Democratic primary for... John McCain. Back in 2000, McCain was still perceived as a moderate maverick, willing to buck his party line rather than toe it. He happened to win the Republican primary that year as well, although George W. Bush went on to win the primary campaign, and the rest is history.
McCain's number were far too small for him to win any Democratic delegates, or to get any sort of attention for that rather unusual showing, but then again it is unlikely that anyone was trying to roust Democratic primary voters to back McCain. If 2008 is any guide, the numbers required to notch a delegate would be somewhere north of 25,000 - Mike Huckabee won one delegate with about 27,000 votes that year, while Rudy Giuliani's 20,000-vote showing was not enough to break the barrier. Note that the allocation of a delegate is not contingent on hitting any numerical milestone; according to the New Hampshire Green Paper, "Candidates must receive at least 10% of the statewide vote to be allocated any delegates" and the allocation is "based on the 20 × candidate's vote ÷ statewide vote," rounded to the nearest whole number.
If the power of organized social networking were dispatched in the cause of convincing enough left-leaning independents and even right-leaning protest voters to head to the polls and write in Barack Obama, it is possible that Obama could secure enough write-in votes to get a delegate - or at least to surpass the meager numbers likely to be put up by the dwindling campaigns of, for example, bottom-feeder Rick Santorum and nut-job Michelle Bachmann.
By the way, in case you didn't know, there are actually some 30 candidates on the New Hampshire Republican Primary ballot (and more than a dozen on the Democratic Primary ballot, including the oddity of Operation Rescue's Randall Terry).
While it is likely that the Republican National Committee would attempt to strip Obama of any delegates that might be awarded, or otherwise dismiss any votes that he might receive, any appreciable support for Obama in that contest would embarrass the Republicans (and perhaps even send Obama himself a hint that he shouldn't be so agreeable to Republican economic policies).