Hmm, so tri-cities used to elect democrats?
Franklin County especially wasn't bad territory for Democrats, especially on the state level, 'round then.
I wonder what were the demographics among whites were among the three towns before Hispanics moved in.
It's a good question. Benton County wasn't especially Dem-friendly, but it already had Hanford. I'm not sure what Pasco was like (although it actually had a significant black population!) It's probably not the farmland that was Dem, judging by neighboring counties.
I know there's a 1968 precinct results book around somewhere.