Here’s a guide for ex-Trump officials for how to tell whether a politician might be telling a deliberate lie or just had a verbal stumble. They were quick to declare Biden was a deliberate “liar” last night on vaccine development. So here we go…1/6

Biden said on CNN: “it’s one thing to have the vaccine, which we didn’t have when we came into office, but a vaccinator — how do you get the vaccine into someone’s arm?” Yep, that’s wrong. Sounds bad. But did he mean it?...

A) Did he say something different elsewhere in the town hall? Yes, just minutes before:  “We came into office, there was only 50 million doses that were available.” That’s a clue he knows the vaccine was created when he became president.

B) Is it different than what he said before? Yes, 1/26: “We want to give credit to everyone involved in this vaccine effort and the prior administration and the science community and the medical sphere — for getting the program off the ground.  And that credit is absolutely due.”

That’s another clue. So the odds are this is a flub, not a deliberate falsehood. He contradicts what he said just moments earlier and what he has said in the past. As fact checkers, we look for patterns and context ....

I know it’s fun to snip a clip and act outraged on social media. But what’s more telling is if a politician over and over says the same falsehood, day after day, no matter how often he or she has been fact-checked. No going to mention any names, of course.