Had the same number call me and ask for my wife.  When I told the caller that my wife was unavailable and asked who was calling and what message I could take the lady on the other end wouldn't give me any information, only that she'd try back later.  My guess is it is politically related.  We've had at least half a dozen people call us (specifically for my wife) looking for political support.  With that being said I should mention that a scam alert is out where callers are using a "spoof dialer" (a program that will mimic a local number and not a 800 number), posing as a political survey organization or some BS and then after a few generic questions asking to verify some personal information as if they already knew it...they don't and are hoping you correct them with the real information.  If you do, your ID may have just been stolen.  Its called the human hack.