Fox News has called Nebraska's 2nd Congressional District for Biden, becoming the first network to do so. They're also the only network to have called Arizona for Biden. Those two places have an important relationship because if Biden wins both Arizona and NE-02, he doesn't need Pennsylvania (although he does need both Michigan and Wisconsin). The dynamics are very interesting for media-watcher types thinking about the editorial independence of Fox News's Decision Desk. The Arizona call was pretty aggressive, but serves as a check against any attempt that Trump might make to claim victory tonight.