I DON'T GET IT

For the last couple of weeks I have been parking at work close to a car that has a bumper sticker which reads 'Thank You George Bush'. The first time I saw it I got the joke and laughed and laughed and clapped and wanted to meet the person(s) who had found this obvious sarcastic bumper sticker. Then, a moment later, I saw the McCain bumper sticker next to it. They were serious?! They're really actually thanking W?! Did I miss something over the last eight years? Or did they miss everything?