"Case closed"

[Odessa Dawn]

"America needs a proven leader with a plan — one who thinks big and can bring all parties together. There’s only one such man in this race, and it’s Mitt Romney. Case closed."

More: PRIEBUS: America needs Mitt Romney

Does case closed mean much more has been said or nor more details needed?
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[HanibalII]

"America needs a proven leader with a plan — one who thinks big and can bring all parties together. There’s only one such man in this race, and it’s Mitt Romney. Case closed."

More: PRIEBUS: America needs Mitt Romney

Does case closed mean much more has been said or nor more details needed?
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More so, 'end of discussion'. It's a forceful way in saying, the opinion given is the only opinion.