Go to the link and select a county and it’ll give you the number of precincts
reporting. You may even be able to get more detailed, I don’t know.
http://enr.ncsbe.gov/ElectionResults/?election_dt=05/06/2014&contest_set_lbl=CON
General impression is that Harris is the one keeping Tillis at or below the 40% threshold where it appears to be occurring, rather than Brannon. Brannon is stronger overall than Harris but holds an outright lead in only one or two counties, none especially large, whereas Harris has a couple of the more populated ones.