Some corporations use their disproportionate lobbying power to obstruct policy. This obstructive lobbying violates most people’s claims to equal political influence. Occasionally, however, other corporations respond by using their disproportionate power to lobby in support of policy. Does this supportive lobbying violate claims to equal influence too? This paper argues that it does, using climate policy as an example. Supportive lobbying does not, in many cases, work to cancel out the influence from obstructive corporate lobbying. Moreover, supportive lobbying violates claims (...) to equal influence even in cases where this lobbying helps equalise the distribution of influence, helps equalise the likelihood of congruence between policy and people’s policy preferences, and helps enforce claims to equal influence held by people in the supportive corporation. (shrink)