As a ruling house, the Wintons have proven extremely capable. Indeed, their only realistic competition as a dynasty has come from the Andermani Empire, and for all its undisputed accomplishments, the Anderman Dynasty has always suffered from a potentially dangerous degree of eccentricity which has never afflicted the House of Winton.

Nonetheless, it eventually dawned on the members of the peerage that the Crown had assumed (some might say usurped) much of the political power the Shareholders had intended to reserve for themselves and their children. It also occurred to them that Elizabeth had enjoyed the strong support of the House of Commons in her maneuvers, for the Commons (elected primarily by the yeomen and zero-balancers imported after the Plague) had recognized that the Constitution stacked the deck against them. In particular, the fact that both houses enjoyed the mutual power of veto but that members of the Lords need not stand for election, gave the upper house enormous leverage in any dispute between them.

Once recognition set in—and once the immediate factional squabbles of the early settlement and post-plague period had been settled—the Lords began to evolve genuine parties. For the most part, they grew up around the old personal factions, but they were also differentiated by clear ideological differences, and as they solidified, they reached out to the Commons for allies. Because of their advantages in not needing to stand for reelection, members of the aristocracy continue to head most of the political parties to this day, but they have learned the hard way to listen to the Members of Parliament from the Commons, as well. Most (though by no means all) Manticoran aristocrats have a fairly strong sense of noblesse oblige(those who do not are among the most self-centered and intolerant of the known universe), but without the input of their allied commoner MPs, the aristocratic leadership of any of the parties would quickly lose touch with the majority of the Star Kingdom's population and suffer for it the next time the House of Commons called a general election.

Despite this, the Star Kingdom's political parties tend to be working alliances of individuals with the same basic interests rather than closed ideological systems even today. Party discipline is often impressive when close votes must be fought through, but there is no "collectivist discipline" in the sense that a member of a party must publicly endorse and support policies with which he disagrees simply because the rest of the party does. MPs are more likely than Peers to "vote the party line," but the tradition of "voting one's conscience" is the Manticoran ideal, and most of the Star Kingdom's political parties have their own distinct "left," "right," and "center" wings.

The more powerful parties are: the Centrist Party and its normal ally the Crown Loyalists; the Liberal Party; the Conservative Association; the Progressive Party; and the so-called "New Men" Party.

The Centrists, led by Allen Summervale, Duke of Cromarty, the current PM, are the largest single bloc, though they do not quite constitute a majority in their own right. The Centrists pursue a rather conservative domestic policy of gradualism and fiscal restraint, opposed to sweeping social changes and determined to avoid deficit spending. More importantly, they have been absolutely committed to the defense of Manticore against the growing Havenite threat for over fifty T-years, having believed that an eventual military confrontation was inevitable and should not be postponed in hopes it would go away. In particular, they believed that waiting for the Republic to weaken, however attractive it might seem, constituted a supine surrender of the initiative to their enemies and so invited long-term defeat. Moreover, unlike certain other political groups, the Centrists believe Manticore can survive open warfare with Haven and that even if they are defeated, the final cost will not be much worse than a craven surrender. It was the Centrists who supported Roger III in instigating the Star Kingdom's pre-war naval build-up and pushing through the annexation of the Basilisk System (a G5 star with a single habitable planet) to forestall Havenite occupation of the Junction terminus in that system, which was at the time a highly controversial move. Some critics saw it as the first step in a deliberate policy of imperial aggrandizement; others saw it as an unnecessary challenge to Haven which could provoke the very war they feared. The majority of Queen Elizabeth's subjects, however, supported the annexation, whatever their representatives might think. Of all the aristocratic-led parties, the Centrists have the strongest support in the Commons, which gives them an added depth that affords rather more clout than simple numbers might suggest.

The Crown Loyalists, led by Henry McShain, Marquis of New Dublin, might be thought of as Manticoran Tories. Their fundamental article of political faith is that stability and prosperity for all Manticorans depends upon the power and authority of the executive in the person of the monarch. From time to time, the Crown Loyalists differ with the current monarch on policy, but in those instances they generally seek to remonstrate in private while preserving a public front of solid support. The Crown Loyalists are extremely weak in the Commons. They are perceived, with a certain degree of justice, as the party of the great nobles, and while they are accorded great respect and deference, there is a belief (even among many Centrists) that they are insensitive to current issues, subjecting all of them to the litmus test of their effect on the Crown's authority (and the nobility's influence). Those who believe this also believe that the Loyalists will oppose any policy, however beneficial its final effects may be in other ways, if it weakens the Crown. In general, the Loyalists share the Centrist view on foreign policy, but they are even more conservative in fiscal policy (they felt pre-war taxation levels were excessive) and have always had difficulty resolving their contradictory support for a strong fleet and opposition to high military spending.

The Liberal Party, headed by Marisa Turner, Countess of New Kiev, advocates humanist reform and is relatively disinterested in foreign policy. They are larger than the Crown Loyalists but smaller than the Centrists and have less numerous but extremely loyal adherents in the Commons. Although disheartened by the current state of affairs in the People's Republic of Haven, the Liberals believe that the fundamental objectives of the Havenite Declaration of Economic Rights (see The Republic of Haven, below) were laudable. In their opinion, the pre-war Legislaturalist Havenite leaders were "bad liberals" who had become prisoners of the "mobocracy" of the Haven System. Their own concern is with "bringing the Star Kingdom into the main stream of modern galactic political thought" (ie., extending and enlarging the franchise, providing relief for the indigent, equalizing income, and promoting greater popular participation in government), and they do not pay much attention to the manner in which affairs beyond the borders may impinge upon Manticore. They regarded the Centrist Party's pre-war concern over Haven as alarmist, believing that however expansionist Haven's current leadership might be, it would hesitate to try conclusions with Manticore (lest it rouse the Solarian League by threatening the Manticore Wormhole Junction) and would eventually reach satiation and cease expanding. Since they preferred to increase spending on human services, they begrudged every penny spent on the fleet, which caused them to lose a great deal of public support once active hostilities with Haven broke out. Nonetheless, they continue to believe that "war never settles anything," and of all Manticoran political parties, they remain most comfortable with the official pre-war ideology of the People's Republic.