Kalshi says it has blocked "dozens" of trades from campaign insiders, but experts say the company's approach leaves lots of potential loopholes. NPR has found at least one trade that slipped through. Campaign staffers looking to profit on political races are still trying to place bets on prediction markets, despite new public scrutiny toward insider trading — and internal efforts to curb the practice. Kalshi, the biggest prediction market company... [6461 chars]