My mom did the same with Domino's, who at one point (i don't know if this is still the case) gave money too Pro Life lobbiest.
As CSD said, it's the local franchise owners who you are dealing with, who may or may not agree with their companies political leanings. Yes, you could put the local guy out of business if you found enough support, and if you knocked out a good portion of francises, you could hurt the overall company, but in the end, you will be doing A LOT more damage to the local guy then anyone else.