I think this combined with the Nassau, NY news brings Republican strength in the suburbs into question. If they can't keep a hold on the suburbs, which seem to be the fastest Democratic trending areas, they need to find somewhere to gain ground. There's not much ground left to gain in rural areas and urban areas would take tons of money and effort. So allowing the suburbs to slip away is allowing relevancy to slip away. The Republican Party is going down a dangerous path by allowing themselves to disintegrate in places like Arapahoe and Nassau. If they lose the suburbs, it'll be a while until they can really compete again.
Does anyone know the information on Jefferson County, Colorado registration?
Over the last 8 years the GOP has concentrated on swinging reliably Dem rural counties to the GOP, and it has worked. However that came at the expense of a lack of message to appeal their traditional suburban base. That hasn't been a factor in the exurbs, but it has been causing significant erosion in established suburbs like Aurora, CO.