Reuters experimented with this the last midterm, but did not for this general election. The AP is generally the source most major news outlets use in the US. I

Reuters experimented with this the last midterm, but did not for this general election. The AP is generally the source most major news outlets use in the US. It's a very difficult operation, with state-by-state rules and some precincts that don't exactly want journalists hanging around all night. Disclaimer: Work for Reuters News.