Would there be any support for a Houston casino? Horse racing is already legal there, but neighboring states are offering higher purses, and horse breeders are leaving Texas at a fervent pace. And in an effort to combat this, the horse racing industry is prepared to fight for the legalization casino gambling. According to the Memorial Examiner breeders registered just 300 foals eligible for horse racing in 2013. The peak for the state was more than 4,000. Concurrently, Oklahoma’s racing industry is booming, raking in $3.6 billion for the state in 2012. The Texas Racing Commission reported that in 2011,…