This is the thing with Romo, people can name the 7 games or more were he made a mistake that may or may have not contributed to a loss. So, let me see if I can rattle off a few off the top of my head. The Jets game, Pittsburgh, Lions game a couple of years ago, Skins game last year, Packers game this year, and if you are really reaching the Denver game. Oh, and the Seattle game to which really had nothing to do with his QB'ing skills.
So, you mean to tell me that you can't find 7 games or more that Tom Brady, Eli Manning, Peyton Manning, Drew Brees threw a costly pick and lost the game for them? Like someone mentioned in this thread, Tom Brady has thrown 3 INT's at the end of the games this year. Peyton Manning threw it across the field for an INT vs the Ravens last playoffs. Eli threw 27 picks this year and let alone has thrown for more than 20 picks in a season three times.
What about that stat they threw out during the Eagles game. We have played in 35 one possession games. How good has our defense been during those 35 games....awful. How many times has the defense stepped up and made a stop when they have to? How many times has it been done for Eli, Brady? A ton. All of this contributes to whether or not a guy is a choker or clutch. Generally, the better the team, the more clutch the QB is considered.
Bottom line is that Romo plays for Dallas. If were playing anywhere else, he would be like Kurt Warner. He would be consider the American dream, overcoming the obstacles. From an undrafted FA to an NFL starter. Period, point blank, end of story.