See, the Democrats did manage to flip Virginia back in the mid-2000's and a lot of people thought it was impossible beforehand, given that Virginia was a staunchly conservative state and had voted Republican for generations.
This was the state that gave us Jerry Falwell and Pat Robertson and has a higher rate of executions than fucking Texas, and so nobody thought it would ever be anything other than a red stronghold.
But the DNC flipped the script by tapping into the large populations of blacks and liberals in Richmond, the Tidewater (Virginia Beach, Norfolk, etc.) and ESPECIALLY the suburbs of Washington DC in Northern Virginia.
Problem is that they think they can do the same with Texas since Austin is a left-wing hipster shithole.
Texas is more conservative overall than Virginia and despite Virginia going blue in the national elections for the past decade or so, it is still very much a swing state overall.
The Democrats really only have strength in Richmond, DC/NoVA, and the Tidewater cities, and possibly a few college towns like Charlottesville and Blacksburg.
There are a few centrist areas that can go either way like Roanoke and the towns of the Shenandoah Valley (Staunton, Winchester, etc.) and the rest of the state still leans Republican, especially Lynchburg (home of Liberty University) and the Appalachian coal counties (Dickenson, Wise, Buchanan, Russell, and Tazewell) flipped the opposite direction and went deep red thanks to Obama's remarks about the coal industry (and Trump capitalized on that)
As strange as this sounds, Appalachia used to lean more Democrat before the 2000's, although the region was still socially conservative at the time (and still is) and most of the Appalachian Democrats were your old-school "Blue Dog Democrats" or "Union Democrats", guys like Jim Webb and Joe Manchin who have become a dying breed in the Democratic Party thanks to both the neoliberal types like Pelosi and Schumer and the younger Justice Democrats who have nothing but utter contempt for the Appalachian people (and indeed most of Middle America)
But yeah, Virginia flipping to the Democrats on the national level (and being a swing state on the state level) was one of those random "lightning in a bottle" scenarios that could not be replicated easily, especially in a state like Texas or the less religiously-inclined red states like Arizona and Montana.