Sounds like they should get a check up front, knowing that this organization could be around a week or 12 months tops.
Sounds to me like the small business owner is not a very smart business person. Another problem is that I bet he is sending his invoice to the wrong location, 9 times out of 10 it is the wrong bill to address. I will bet he is using the state HQ address instead of the where the National HQ and the check are cut.
Not that I ever worked on a campaign before.
The reason Newt stayed in the campaign was to retire some of that debt, not to hang on and spend your $2000 Mr. Small business Moderate Republican, yea we know about you....