I need some help snapping my husband out of a funk.

I'm trying to be as supportive as I know how, but lately it seems the only conversations we have are him ranting about co-workers or him ranting about the US primaries (and I'm not even American). In the morning, I only see the top of his head because he's on his phone reading political stories. After work, he's on the computer writing long responses to family members/friends with differing political views. We're living in my home country, so I get he misses home and being involved. I'm trying to give him space to do this, but it's become all-consuming. I've had to resort to doing my own research on the US election to have him interact passionately with me. It's becoming really lonely and I'm starting to snap a bit. We are normally really in sync, so I'm feeling at a loss of what to do. I've talked to him about it and he acknowledges it and then 5 minutes later, it's back to this new normal. Any advice on how we can work towards getting back on the same page?