The answer is simple: corporations only have the rights they are granted by their owners.<p>I have the right to free speech and and I can use my possessions to exercise this right. I can criticize Obama verbally, in a document on my computer or I can publish that document to my website. Why can't I use my corporation to pursue the same goal?<p>I also have the right to vote. I don't get a second vote for my computer, however. Similarly, my corporation doesn't give me another vote.<p>Corporations don't have free speech. Their owners have free speech, and they can use their corporation to exercise those free speech rights.