For one thing, if the entire SCOTUS decision was hinged on corporations being equal to citizens, [since being superior is out of the question as per the 14th Amendment], then if it can be demonstrated that any corporation has committed a felony or other crimes, then their board of directors [in their entirety] can be tried and jailed or otherwise face the penalties that any other citizen must bear. If this cannot be done, if no "one" person can be fingered as accountable for the actons of the corporation, then it does not have a 'body" that is tangible in order for citizenship to apply. Because citizens are not only bodies with freedom, they are bodies with accountability. Without accountability for redress in law against the corporation for, say, committing felonies or otherwise endangering others or the environment that others have to live in and around, corporations do not pass the test of "citizenship".
There are no supercitizens. The 14th Amendment guarantees equality. Here is the language again:
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"All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside. No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws."
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The SCOTUS decision has repealed the 14th Amendment in allowing unlimited influence in elections. Since money is a de facto part of the predicted outcome of any election, and there is such a fiscal disparity between corporations and singular citizens or even nonprofit citizen groups, the five Justicies have taken away equality among citizens. In other words they have repealed the 14th Amendment because taking away the ability to influence elections is the very heart of our democracy and the Constitution itself. But more specifically to the 14th Amendment, the SCOTUS 1/21/10 decision allows "abridging" to the powers of everyday citizens to affect their own destinies.
However there is a remedy. And Congress can effectively overturn this decision because of the last line of the 14th Amendment which reads:
"The Congress shall have power to enforce, by appropriate legislation, the provisions of this article."
"Appropriate legislation" is up to the interpretation of the current sitting Congress. And last time I checked that Congress has a democratic majority. It doesn't say the Congress needs a supermajority. It doesn't say anything at all specifically, only that Congress has the power to enforce the language of the 14th Amendment to which the SCOTUS decision has repealed without due process. The Supreme Court has the power to interpret the Constitution, not to repeal it or any part of it.
The SCOTUS decision is therefore outside its powers. Congress trumps the Court in this instance. There is no language in the Constitution that gives power to the Court to usurp the very essence of the Constitution or any of its Amendments.
There's your argument. Proceed.