With proposals to rein in prediction markets proliferating through the halls of Congress in recent weeks and months, Kalshi — one of the biggest players in the booming industry — went on defense. The New York-based platform launched an ad campaign throughout Washington, rolling out mint-green spreads on billboards, bus shelters and inserts in The Washington Post. The ads seek to deflect the spate of criticism being hurled Kalshi's way and to position it as different from Polymarket , the other