Is President Donald Trump crazy? Not can-you-believe-he-really-said-that? crazy. Certifiably-mentally-unfit-to-serve-as-president crazy. It's an outlandish assertion — insulting, really — and a measure of the antipathy of Trump's critics that some, including members of Congress, have seriously raised the subject. Which brings us to the 25th Amendment. Born of the Cold War and enacted after the assassination of…

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