Doesn't matter - if politicians realize that their constituents are willing to pay to keep them in office when they go against corporate interests, we are going to see some real change in Washington.
Can we really compete on that point? Corporations have quite a lot of money compared to most generous private citizens... even those private citizens combined.
That's an interesting point to ponder - do corporations really have more money than private citizens combined? Aren't corporations ultimately owned by private citizens? Certainly the wealth of individuals is spread more thinly and so is harder to mobilise for a particular cause.
There's an important distinction between the set of "private citizens" and "private citizens willing to donate funds to government officials." The latter is a much smaller subset of the former.