I agree 100%! I am from NC and what you don't want to do is substitute a 100% liberal Democrat for an 88% conservative like Burr! Burr is the incumbent Senator that the Dems are most confident of being able to defeat, so why would you do something that makes that easier to do? I like Brannon and voted for him in the primary that current Senator Tom Tillis won, but I don't agree with weakening an incumbent Republican Senator because he is not perfect - especially in a year that the numbers favor the Democrats!
Burr is the incumbent Senator that the Dems are most confident of being able to defeat, so why would you do something that makes that easier to do?
A question: Do you think Juan McCain should be primaried in Arizona?