I don't get this Atlas meme that a challenger should be embarrassed if they lose to an incumbent. Incumbents win more than 9 times out of 10 in most election years.
Nevada is one state that seems to keep their Senate incumbents running for reelection. How many times was Harry Reid "doomed," but managed to hold onto his seat? There's zero shocks here if Heller holds on and Rosen has nothing to be embarrassed about if she loses.
It's still a tossup either way. Rosen should be embarrassed if she loses.