The real reason it's going to take a while to know who won in some midterm races

Hint: It's not only because California counts slowly.

<img src='https://npr.brightspotcdn.com/dims3/default/strip/false/crop/5669x3868+0+0/resize/5669x3868!/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2Fed%2Fae%2F1281a3b9443d99ea35ed88de00d1%2Fgettyimages-2280066898.jpg' alt='Election workers process ballots for the California state primary at the Los Angeles County Ballot Processing Center on June 5. California's relatively slow vote count has put "a big target on its back," one expert told NPR.'/><p>Hint: It's not <em>only </em>because California counts slowly.</p><p>(Image credit: Justin Sullivan)</p><img src='https://media.npr.org/include/images/tracking/npr-rss-pixel.png?story=nx-s1-5982027' />