For the ideologue, sound political doctrine is everything. Knox was ideologically committed to a commonwealth that was Christian, Protestant, and Presbyterian. The ideologue loathes compromise, pragmatism, and playing politics. Every government program to the ideological conservative leads to socialism and one-world government. Every tax break to the ideological liberal leads to the oppression of the poor by the rich.
Principles are all that matters.
The political manager operates under a different system. For him, politics involves one thing, that is winning. Second place winners are first losers. The manager recognizes that you must always have something to show for the effort. The manager realizes that the politics of pragmatism is politics, that compromise is the American system, and that playing politics is rough and tumble.