Sports betting legalization is sweeping the NFL, so keep an eye on PENN and DKNGThe NFL season kicked off just last week, already providing sports bettors with some upsets. The American Gaming Association expects $35 billion in wagers this season amid the widespread legalization of sports betting, drawing the attention of plenty of investors. With this in mind, we're checking in with two heavy hitters in the sports betting industry: DraftKings Inc (NASDAQ:DKNG) and Penn Entertainment Inc (NASDAQ:PENN). PENN ...