What's the place in northern Franklin where Cantwell won precincts?
City of Connell. The D>60 precinct had only 20 votes; the D>50 precinct was a very narrow win. Overall, it voted McGavick by 12. There's a significant Hispanic population there; whites are only a plurality.
The other precinct (rural) had 44 votes, and was 55% Cantwell. I can't explain why; Kerry got 27%. Let's just call it a blip.
(In my defense, I had to look that up...most of it.)
As you can probably guess, even though they're poorer, Franklin County whites are much more Republican than Benton County whites. I'd characterize Benton County as a little more cosmopolitan, but it's still really Republican for a Washington metro area.