This is not new. I saw it happen like on C-SPAN in January. It took me a while to find video of it and have only now been able to capture & edit the video. I've talked about it on DU a couple of times and others have told me this is not the only time he's done this.
McCain arrives at a New Hampshire campaign event, greets some people he barely knows (if he knows them at all), then turns and sticks his hand out for that lady in the red jacket to shake. Only problem is that lady is his wife. Check out the look on her face and his reaction. She tells him to "go down there."
Watch this and then tell me that it's unfair to point out that he's a dottering fool.
I welcome suggestions for a snarky audio overdub - or feel free to do it yourself.
I also invite you to comment & rate on YouTube as I imagine I will get some Freeper comments.