Nate Silver sizes it up:
[Romney] is by far the best-funded candidate, and should have the wherewithal to build the best turnout operation. It is not clear, however, how much emphasis Mr. Romney has placed on this part of his campaign. When I visited the various campaign headquarters in New Hampshire, Mr. Romney’s office was the busiest and the best run (although Ron Paul’s was reasonably close). Still, Mr. Romney’s office in Manchester was the only one he had in the state. In contrast, Barack Obama, Hillary Rodham Clinton and John Edwards each had 16 field offices in New Hampshire in advance of the 2008 primaries there.
And if one field office can keep you covered in a state like New Hampshire, where pretty much everything is within a 90-minute drive of Manchester, the same does not hold true in a larger state like Michigan (Mr. Romney’s Web site lists only one campaign office in the state).