This could really end up working in her favor! She can claim the "establishment" was upset that someone might actually represent the people of Delaware and they are going to punish Delaware republicans and get the Delaware independents to knuckle under as well.
Americans HATE being told what to do.
Who gives a hell about the NRSC - They are useless fools anyway when it comes to running campaigns or putting in ad buys - There stance here is foolish, especially when as others have pointed out...they supported the Specters, Snowes, etc, etc all these years.
With that said, imploding the GOP is not the answer. Becoming ugly toward others you otherwise agree with 70% of the time is not wise....Lets slow it down. Lets focus on GOP candidates (the good and the bad ones...but especially the good ones) winning this November.