The single greatest weakness of American parties is their inability to achieve cohesion in the legislature. Although there is some measure of party unity, it is not uncommon for the majority party to be unable to implement important legislation. The unity is strongest during election campaigns; after the primary elections, the losing candidates all promise their support to the party nominee. By the time the Congress convenes, the unity has dissipated. This phenomenon is attributable to the fragmented nature of party politics. The national committees are no more than feudal lords who receive nominal fealty from their vassals. A member of Congress builds power upon a local base. Consequently, a member is likely to be responsive to local special interest groups. Evidence of this is seen in the differences in voting patterns between the upper and lower houses. In the Senate, where terms are longer, there is more party unity.
Which of the following, if true, would most weaken the author’s argument?(A) Members of Congress receive funds from the national party committee.
(B) Senators vote against the party leaders only two-thirds as often as House members.
(C) The primary duty of an officeholder is to be responsive to a local constituency rather than party leaders.
(D) There is more unity among minority party members than among majority party members.
(E) Much legislation is passed each session despite party disunity.
Source: Master GMAT