People
A conservative is a man with two perfectly good legs who, however, has never learned how to walk forward.
— Franklin D. Roosevelt

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
This is a joke built on a physical image. A conservative, the quote says, has two perfectly good legs yet never learned to walk forward. It's a pointed jab at resisting change, portraying that outlook as unwilling to move even though nothing is stopping it.
Context reviewed