I have often wondered what would have happened if Tony had not fumbled the snap in Seattle. I know it wasn't as a quarterback but It was still Tony Romo who fumbled and he had to hear it all of the next off-season and beyond. I do think the media has some say in who is clutch and who is a choker. Tell someone that he cant do it (especially an undrafted FA) and it gets in his head and becomes a psychological block.
Tony Romo received way too much blame for the playoff loss against the Giants and Vikings but he certainly heard the criticism from the media. I think now he presses when he is put in that situation and maybe a sports psychologist is his only hope left at this point.