Yes, and no. Of course by signing any petition that opposes anything that congress is doing, trying to do, or already has done puts you on that proverbial black list and you are scrutinized more closely than those who kiss up to them, or say nothing at all.
But if we do not speak out against the things we find repugnant, then we are in essence condoning and agreeing with those attacks perpetrated on us by the government and their allies (big business, wall street, the wealthy, etc.., and companies like Monsanto that is altering all of our foods without any restrictions, or concern for public health and safety both by them and the government).
According to congress we as individuals do not deserve to know what is in our foods if it might take a few dollars in profit away from their benefactors.
the more people who speak out, the louder our voices become and the more apt congress will at least consider our voices before they stab us in the back.