No. People have just as much freedom of speech when they do so as groups as when they do so as individuals. To strip away the right of groups of people to lobby is A) to wrongfully deny them the ability to petition their government and B) to place power even more overwhelmingly in the hands of wealthy individuals.
But I continue to be amused by the people who don't think through the consequences of their actions, and just rant against lobbying. Who Knew TheDemSocialist would want to put a greater concentration of power in the hands of the billionaires?