Preventing a company from getting gigabit connections is not bad for you if you are the company that competes against those gigabit connections. It isn't wrong or shady of Comcast to donate like this, just like it isn't wrong for the original poster of this link to post it here and get awareness and activism for the other side.
As an aside, I despise Comcast, Time Warner and many of their ilk, but they are completely well within bounds to do this.
I didn't say it was good or bad. It is a legally, ethically and economically acceptable practice. They are exercising their right to protect their business.
As a European, that's something I have a hard time understanding. How can it be legal for a corporation to buy politicians? Corporations are not people in any meaningful sense of the word.
They are not buying any more than you are buying a politician by donating to their campaign, putting up a sign with their name on it in your yard or voting for them.
Many people think this is buying, it is simply helping the candidate you agree with the most win the election.
As an aside, I despise Comcast, Time Warner and many of their ilk, but they are completely well within bounds to do this.