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Political parties are prominent in legislative politics and legislative research. Using data from the 99th Congress, this article assesses the degree to which significant party behaviour -defined and operationalized as behaviour that is independent of preferences -occurs in two key stages of legislative organization: the formation of standing committees and the appointment of conferees. Four hypotheses are developed and tested. When controlling for preferences and other hypothesized effects, positive and significant party effects are rare. A discussion addresses some criticisms of this unorthodox approach and attempts to reconcile some differences between these and previous findings.

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Electoral-connection theories of legislative politics view bill cosponsorship as low-cost position taking by rational legislators who communicate with target audiences (e.g., constituents) external to the legislature. Legislative signaling games suggest a view of bill cosponsorship in which early cosponsors attempt to communicate to target audiences (e.g., the median voter) within the legislature. Using data from the 103rd U.S. House of Representatives, we show that the timing of legislators' cosponsorship decisions are more supportive of cosponsorship as intralegislative signaling than as extralegislative position taking. First, policy extremists on both sides of the political spectrum are more likely than moderates to be initial endorsers of legislative initiatives. Second, extremist-moderate differences diminish over the course of bill histories.