A bit off target. Corporations were not formed for business convience such as having one person sign a lease rather than "..all the stockholders". If that were the object, a part of the shareholders' agreement would be some designated company officer could sign. They were formed as a means of limiting the liability of shareholders to thevalue of their shares and corporate "personhood" - a neologism for juridicial persons, I assume - is to avoid responsibility for their actions when they're acting "for the corporation". The parts about the First Amendment, of course, are entirely correct: those who own a business via the corporate form of organization have every right to support whoever and whatever they want in politics.