Aidy Boothroyd sent his side out looking for a third successive victory but goals in each half from McCombe and Rigg made it an uphill task.
Bayo Akinfenwa gave the 5,803 crowd hope with a goal ten minutes from time but a comeback proved beyond the Cobblers, who remain in the relegation zone.
Reaction to follow on Cobblers Mad.
Source: FOOTYMAD