Hehe.
Actually, I think it explains why McCain bothered to campaign in Massachusetts right up to the end, when typically candidates write off their opponents' home states as wasted time and money. McCain knew that Massachusetts wasn't that kind of absolute lock for Romney. Ultimately his home-town status was too big a factor to overcome, but the state was pretty competitive, especially considering Huckabee was a non-factor (whereas, elsewhere, he's been splitting the conservative vote with Romney and handing McCain the state).
McCain lost by only ten points in Massachusetts, despite Huckabee pulling a dismal 4%. That compares to a 17-point win for Clinton in New York, a 40-point win for Huckabee in Arkansas, a 42-point win for Clinton in Arkansas, a 32-point win for Obama in Illinois, and a 14-point win for McCain in Arizona. Romney's performance in Massachusetts was the worst showing by a candidate on his home turf.
In his defense, he did wonderfully in Utah -- then again, they never had to suffer through four years with him as governor, did they?