Yeah, you just let me know, OK? Your little theory is nice... it works in some places and not in others, so is basically just a silly theory that doesn't have much to do with anything. Texas has grown and grown and become more and more urban and is only getting more conservative. No one in Texas has ever even seriously mentioned having a state income tax that I know of. And Democrats are a dying breed in Texas so the trends seem to be against your theory there.
Actually there have been some legislators that suggested bringing an income tax in to replace property taxes. Almost all of the ones that do that seem to lose the next election.
If Texas is becoming more conservative, how do you explain you?
Population densities of U.S. counties that went for Gore compared to those that went for Bush in the last election:
Gore: 127,000,000 million people in 575,184 sq. miles = population density of 220 people per Square Mile
Bush: 143,000,000 million people in 2,432,456 square miles = population density of 59 people per Square Mile
Therefore, the greater the population density, the more votes someone like Gore gets.
And as I remember, Bush lost the popular vote as it was and despite leaning way over to the left.
And you want to add more people?