The anti-government Tea Party Right wants to eliminate everything that the Federal Government does relating to the economy since the Progressive Era of the early 20th Century. The pro-big government McGovernite New Left wants government to do practically everything for people even tell them what they can eat and drink and what light bulbs they can have. How they can spend their money in general and how we can talk to each other, what media and ideas are acceptable, how we get our own media, what we can call our sports teams.
The Tea Party Right wants to eliminate the parts of the Constitution they don't like. Like how we elect our members of Congress so fewer people who disagree with them and have popular support get elected. The New Left wants to throw out the Constitution all together, or at least for the most part and perhaps the Federal Republic and our federalist system. And replace it with a unitary superstate where Uncle Sam and his nephews and nieces know better and know what is best even for tens of millions of Americans they don't even know exist.
The Democrats have their nuts and escaped mental patients as well and they are even visible in Congress. The difference is the Republican Tea Party escaped mental patients are more visible and vocal because they are better funded. Because they aren't anti-wealth, anti-money, anti-business, anti-private enterprise unlike the McGovernites on the New Left and are able to get their message out for the media to see, hear and report it. And the Democratic Party does a better job of keeping their mental patients locked in the closet where they belong so the media can't take them serious as commentators and experts.