The Conservative Association, headed by Michael Janvier, Baron of High Ridge, is the smallest of the traditional political parties and might charitably be termed reactionary. It advocates an isolationist foreign policy, argues that foreign adventures are dangerous, and decries the "steady, liberalizing rot threatening Manticore with anarchy." As might be surmised, the Association is something of a crackpot group which attracts the nobles who find the Crown Loyalists entirely too permissive in defense of privilege. Indeed, they advocate return to an "original Manticoran balance of power" which never actually existed outside the imaginations of their own theorists. Although they felt the Centrists' annexation of Basilisk was an act of madness, the very sort of adventurism which could plunge Manticore into disastrous confrontation with foreign powers, Roger III and Cromarty knew they could be counted upon to support fleet appropriations, as their isolationist bent required a powerful fleet to police their borders.

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The Progressive Party, headed jointly by the Earl of Gray Hill and Lady Elaine Descroix, is the third largest party and, in general, endorses many of the objectives of the Liberal Party. The Progressives share the Centrist determination to avoid deficit spending (which the Liberals see as an acceptable, temporary evil), would like to see "a better and more beneficial balance between social spending and military appropriations," and share the Liberals' distaste for foreign policy. Unlike the Liberals, they have never regarded concerns over Haven (which they see as an example of deficit-spending liberalism run berserk and corrupted by power-seeking politicos) as alarmist. On the other hand, they also felt (and, apparently, still feel) that any belief that Manticore can survive a fight to the finish with the Havenite military machine is lunacy. (Since the beginning of actual hostilities, the Progressives have been very vocally and publicly confident of Manticoran victory, but their opponents believe this is camouflage. According to this theory, the Progressive's present posture is designed to make their fear-based desire for a negotiated settlement appear to stem from their complete confidence in victory, instead.)

Because their primary concern is with domestic issues, their traditional foreign policy has always tended to be extremely simplistic, believing that "honest negotiators" can reach a live-and-let-live arrangement. Their pre-war Centrist and Loyalist critics argued, not without justification, that this really amounted to advocating that Manticore sell out the rest of the galaxy to save its own skin, a policy which must ultimately result in disaster when there is no more galaxy to sell to Haven. Yet while this may well be a not-inaccurate reading of the effect of their policy, it is unjust to argue (as their critics do) that it was their intended object. The real problem with the Progressives' foreign policy is that they simply don't think about it very much, relying on platitudes and vague beliefs rather than a reasoned analysis, which left them with no structured thought upon which to base themselves once the Havenite Wars actually began.

The "New Men" Party, led by Sir Sheridan Wallace, is a relatively new group which believes that power is far too concentrated in the hands of existing cliques of the aristocracy and wealthy merchants/industrialists. They argue that the traditional Manticoran practice of co-opting capable and ambitious individuals into those two groups is a mistake. The Centrists and Loyalists believe that co-option assures a continuous flow of new ideas into the aristocracy and financial elites in a controlled, gradualist fashion, whereas the Liberals and Progressives argue that the very concept of aristocracy is anachronistic and anti-democratic. The New Men view the practice of co-option as a deliberate, undisguised mechanism to keep control firmly in the hands of traditional power groups, which is rather Liberal-sounding—until one realizes that their problem is less that there are traditional elites than that they don't control them. In a very real sense, the New Men are the lesser nobility's counterweight to the Conservative Association, mounting perennial assaults on the bastions of power and entrenched privilege. Unlike the Liberals and Progressives, however, they believe that the spoils belong to the victors and are not out to overturn the system, but rather to seize the levers of power for themselves. The New Men have only the most rudimentary fiscal policy and share the Conservative Association's fundamental isolationism, yet distrust the military as one more bastion of the Powers That Be. In general, the New Men might be said to be in opposition to everyone. They enjoy the least support in the Commons of any of the major parties, but their intense party discipline puts Wallace in a position to reliably deliver an organized block of votes essentially at will. This, coupled with his readiness to make deals with anyone on a purely pragmatic basis, gives him much more power within Parliament than simple numbers might suggest.

In addition to the parties listed above, there are several small,ad hoc factions which come and go, generally focused around a single charismatic leader. The real power struggle is between the Centrist/Crown Loyalist alliance and the Liberal/Progressive Alliance, with the former holding a slight edge in the Lords and a larger one in the Commons. The Liberals and Progressives tend to be allied on a stronger, deeper, and more permanent basis than the Centrists and Loyalists, helped by the fact that both of them regard foreign policy as a distraction from the real concerns of the day. The Centrists and Loyalists often find themselves divided over particular points of domestic policy, but maintain a fairly united front on foreign policy and military preparedness. Both enjoy the support of the Crown, which is a decided plus, though the Loyalists remain far from convinced of the wisdom of the Centrists' pre-war willingness to accept (some would say court) a confrontation with Haven. Traditionally, the Conservative Association has helped tilt the balance in favor of the two Crown parties because of its insistence on maintaining a powerful fleet, but the potential has always existed for the Association to strike a deal with the Liberals and Progressives on foreign policy, although the fundamental antipathy of their domestic policy positions makes it unlikely an alliance between them could last. The real joker in the deck is the "New Men." For all their relatively small numbers, they are concentrated in the Lords, where the Centrist/Crown Loyalist majority is thinnest. No one in any party believes that the New Men could work indefinitely with the Liberals or Progressives, whose domestic policy is fundamentally at odds with their own, but the possibility of a temporary alliance to break the "stranglehold" of the Centrist/Crown Loyalist group is not at all out of the question. It would be a cynical marriage of convenience on both sides, probably with the tacit understanding that once their common foes had been smitten hip and thigh the Liberals, Progressives and New Men would fight it out to a conclusion, and the real fear of Duke Cromarty and his inner circle is that the New Men may decide the Liberals and Progressives are so evenly matched that, once the "entrenched power brokers" have been toppled, the New Men would find themselves in a position to control the outcome by choosing whom to support.