If you frequent Clarendon or other highly-populated Arlington neighborhoods, you’ve likely encountered them: flourescent-vest-wearing young people stopping passersby to solicit support for the environment, civil liberties, or other causes and organizations.
They’re usually friendly, though persistent, working in teams to ensure no one walks by without a pitch. Even intensely looking down at one’s phone and/or wearing headphones does not seem to discourage many from approaching as you walk down the sidewalk gauntlet.