Susan Shelley: The policing of political speech

Just before Hillary Clinton lost the 2016 election to Donald Trump, a 26-year-old Twitter user named Douglas Mackey posted some memes that got him indicted on federal charges.

But not immediately. Mackey wasn’t indicted until January 2021, days after Joe Biden took office.

The Twitter posts that the government said were made in violation of federal law were captioned pictures styled to resemble campaign ads. The text on the pictures said supporters of Hillary Clinton could vote for her by text message...