Both parties are in chaos. Can this be explained with my regression analysis: D = socialist; R = independent?

We can play that game Sir, If Kennedy were alive today he would be Republican. The DEMs today are far left of 6 o clock and the right are at about 4PM the whole model is slowly sliding to give me free shit and I'll vote for you. How do you boil a frog, turn the heat up very slowly....1st action to insure Socialism is public health care, control the schools and thereby the doctrine the children grow up with.....were sliding left, it's like a glacier, slow and no stopping it. Trump is the "I hate this game" vote.
America will never be destroyed from the outside. If we falter and lose our freedoms, it will be because we destroyed ourselves.
Abraham Lincoln

The reality is this... There is the whole spectrum of mild, moderate and "extreme" liberal and conservative candidates who run each cycle. The primaries are composed of "moderates" like Romney and Clinton and more left or right candidates like Santorum or Sanders. In between there is typically a dozen candidates that are all over the place. If you can get a solid base of 5 to 10% you will raise money, build strength and potential long term personal financial stability (example Palin and probably Sanders). They each attempt to find their base to win the nomination, then move to "moderation" and go for broke in the general.

I reject your loaded assumptions and therefore your question.
"Socialist" has a lot more meaning and emotion behind it. In the US, it's a pejorative.
Even Bernie wasn't a socialist. He said he supported the Nordic style of Democratic Socialism, which bears no resemblance to the Stalinism an American means when he says 'socialist.'
In fact, the American Socialist Party and the American Communist Party both reject Bernie, saying he's not a socialist, he's just another Democrat. Check it out.