A few weeks ago, Representative Dan Crenshaw, a Texas Republican, falsely claimed that the centerpiece of President Biden’s domestic agenda, a $1.75 trillion bill to battle climate change and extend the nation’s social safety net, would include Medicare for all.It doesn’t, and never has. But few noticed Mr. Crenshaw’s lie because he didn’t say it on Facebook, or on Fox News. Instead, he sent the false message directly to the inboxes of his constituents and supporters in a fund-raising email.Lawmakers’ statements on social media and cable news are now routinely fact-checked and scrutinized. But email — one of the most powerful communication tools available to politicians, reaching up to hundreds of thousands of people — teems w …
