IIRC, there are two American political parties (that aren't small cults of oddballs), and they are both coalitions:
The Not Democrats - a coalition of groups with absolutely nothing in common except that they are not members of the Democratic Party.
The Not Republicans - a coalition of groups with absolutely nothing in common except that they are not members of the Republican Party.
Who exactly these "Republican Party" and "Democratic Party" are is a mystery. I believe they are mythical.
The Not Democrats - a coalition of groups with absolutely nothing in common except that they are not members of the Democratic Party.
The Not Republicans - a coalition of groups with absolutely nothing in common except that they are not members of the Republican Party.
Who exactly these "Republican Party" and "Democratic Party" are is a mystery. I believe they are mythical.