Senator Kerry displayed the middle digit to a fellow Vietnam veteran who disagreed with his post-service behavior.
In front of schoolchildren.
He also accused him (without basis, as far as I know) of being “a felon.”
[Update on Wednesday afternoon]
I’m going to amend this post to “Newsmax claims that Senator Kerry displayed…” since I can’t find any other sources for the story. I still don’t find it out of character, though.
[Wednesday evening followup]
Here’s some more on the story, but unfortunately, it’s still Newsmax.