Optical parties? What are those? 8^)
Seriously, political parties USED to be a bunch of people gathered together through some common political principles. The Democrats and Republicans seemed to represent two different political philosophies, both relatively practical and justifiable and respectable. But what I think has happened is that the parties have deteriorated to just two competing centers of power, two nationwide street gangs.
My feeling is that money did this. Elections have gotten so expensive! Both parties desperately need truckloads of cash and they both get the money from the same sources, the same sponsors. So they represent them, not us. Neither party wants to help the middle class. Neither wants to fix the problems we have because the top 1% doesn't have these problems. The middle class is shrinking and endangered, and most people are poorer over time while the rich and corporations do better year by year, decade by decade.