Duverger's Law and this video give some insight of how to get to a 2 party system. Alternative parties often hear "spoiler" or "wasted vote" when talking to people about making a choice outside the two old parties. Shouldn't that be a sign that something is wrong? Why can't you express yourself how you wish on a ballot?
Approval Voting fixes that issue by allowing all voters to maximize how they wish to express themselves. There are other alternative voting system and they are also better than the antiquated one we use. The old parties, like so much of how they run government, is simply outdated and they keep it that way because it serves them, not you.
You can learn more about problems with our voting system and Approval Voting at ElectionsScience.org.
Texans can have a better political system. The old parties just don't want it.