The Rationale behind Article III, Section 2 of the United States Constitution

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To understand the rationale behind Article III, Section 2 of the United
States Constitution which states, "In all cases in which a State shall
be Party, the Supreme Court shall have original Jurisdiction," we
can turn to the author himself and the words that he published in The
Federalist, Circular Number 10, New York Packet, and November 23rd,
1787. The article is titled "The Union as a Safeguard against Domestic
Faction and Insurrection."
In the article James Madison said,
“No man is allowed to be a judge in his own cause; because his
interest would certainly bias his judgment, and, not improbably,
corrupt his integrity. With equal, nay with greater reason, a
body of men are unfit to be both judges and parties at the same
time.”
Article III Judicial Branch
Clause 2 Supreme Court Jurisdiction
In all Cases affecting Ambassadors, other public Ministers and
Consuls, and those in which a State shall be Party, the Supreme
Court shall have original Jurisdiction. In all the other Cases
before mentioned, the Supreme Court shall have appellate
Jurisdiction, both as to Law and Fact, with such Exceptions, and
under such Regulations as the Congress shall make.