On the Politics beta, nobody has the beta badge, although 16 people fulfilled their commitment.
By comparison, other recent betas have beta badges: 58 at ExpressionEngine, 25 at Robots, 32 at Geneology & Family History, 29 at Academia, etc.
According to this answer, The beta badge is for those that participated in the private beta week. It is awarded shortly after the public beta starts.. According to this answer, participated means earning at least three bronze badges (ultimate source here).
Why not at Politics SE?