Here is a reply from years ago:
Governing is about exercising power. Political parties are about appropriating that power to one's own purpose. The founding fathers created a government containing many checks and balances in an effort to frustrate human tendency to consolidate power in one tyrant or, on the other hand, to concede power to the mob. Political parties in America are designed to overcome the checks and balances put by the framers into the Constitution.
The peculiar architecture of the American federal system with its bicameral legislatures, tripartite "coequal" branches of government, staggered elections for various branches, Constitutional limitations of government power especially freedom of the press and speech, are designed to make government impotent in the absence of a general consensus. The purpose of political parties is to provide that consensus for its constituents' point of view, to provide a consensus about how power should be wielded across the various competing entities of government.
The peculiar architecture of the American federal political system with its checks and balances means that it functions properly as a two-party system. Any successful attempt to form a third political party invariably condemns the political party from which it shoots off and to which it is most closely ideologically aligned to oblivion. Since it is human nature to entertain incessant arguments over the proper application of political power, political parties in America have developed a survival mechanism, they co-opt the principal grievances of the splinter group and make the dissidents' platform their own. This has been the history of political parties in America since the beginning. When a new ideology becomes popular, one party or the other seeks to absorb it.
If the party misjudges the public mood and embraces a splinter ideology in an effort to co-opt when that ideology is too radical to be palatable to the general public, the party loses the next election because it moves out of the mainstream. If the party misjudges the other way and declines to co-opt a movement that happens to be of sufficient strength, the party loses the next election because it has fractured its base. If a party attempts to absorb views of the other party or approaching that of the other party, it risks losing the next election by alienating its own base. If it fails to absorb views approaching the ideology of the other party, it risks losing the next election by isolating itself to its own base.
Political parties are eternally faced with the same dilemma: should the party dilute its core message to attract less ideologically motivated voters or should it confine itself to a pure message and energize its core constituents? In attempting to solve these tensions, political parties are like amoebas or yeasts, everlastingly dividing or growing.
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If one political party becomes rogue the other party must unify, discipline its Mavericks and counterattack with one voice. This is what Justin Amash obviously does not understand. He would take the Republican Party into weakness at the very time when the survival of the nation could depend on our freedoms' spokesman's virility.
