Herndon is in a Republican Congressional District, surrounded by a Republican magesterial district within the Fairfax County government. It's an independently governed town, pretty ethnically diverse, middle-class, bedroom community.... mostly mid-to-upper level government and management types.
Ethnic breakdown of the local high school (which is pretty indicative of the town overall) is: 11.7% Asian; 9.8% black; 17.8% Hispanic; 57.5% white. Average SAT's at the local high school are V-547; M-560.
You're misleading by mentioning the Congressional district as Republican meaning Herndon was also Republican.
Herndon went clearly for Kerry and Kaine (gov) both Democrats in the last two elections. It has changed from a Republican area to a clear Democrat majority over the last 20 years.
In this non-partisan election, people from both sides of the aisle decided they had had enough, and threw the bums out.
It's a lesson for the rest of America. Nuts to the ruling class - we can win this battle against the alien invasion if you try.
SI, SE PUEDE!