Robert F. Kennedy Jr.’s endorsement of former President Donald Trump is a marvel to behold. It’s astonishing that such a prominent member of America’s quintessential Democratic family embraced the most conservative Republican nominee since President Ronald Reagan.

If a majority of Kennedy’s roughly 6% of likely voters support Trump on Nov. 5, they could compose the 3.1% that he might need to edge Vice President Kamala Harris in a photo finish.

But Kennedy should add value beyond Election Day. If reelected, Trump should ask him to chair a new Presidential Commission to Make Free Speech Great Again.

Kennedy and his fellow commissioners should investigate federal assaults on the First Amendment, most notoriously Washington, D.C.’s election-interference campaign to censor news coverage of Hunter Biden’s “Laptop from Hell.”

“The FBI warned us about a potential Russian disinformation operation about the Biden family and [Ukrainian energy giant] Burisma,” Facebook founder Mark Zuckerberg wrote House Judiciary Committee Chairman Rep. Jim Jordan, R-Ohio, on Monday.

After the Oct. 14, 2020, New York Post exposé of........

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