We investigated why a legislator would be willing to vote “yea” on final passage of a bill but would choose not to cosponsor that bill. We tested a series of hypotheses regarding the cosponsorship decisions of individual senators, using a dataset that includes every major initiative that was introduced and received a floor vote in the Senate between 1975 and 2000. We found that senators are more likely to cosponsor bills when their preferences diverge from the Senate median but are closer to those of the bill's sponsor. Also, senators are more likely to cosponsor bills when they sponsor a higher number of bills overall, when they become more connected with colleagues, and when their constituents increase demand for legislation within particular policy areas. Senators are less likely to cosponsor bills if they received a higher percentage of the general election vote in their most recent election.

Popular and scholarly accounts argue that signing statements are important tools for presidents to shape the implementation of policy. Although signing statements might be important presidential tools, the legislative branch stands in the most immediate and direct competition with the executive for ultimate control of the bureaucracy. In this article, we assess whether congressional committees react to presidential signing statements with increased oversight. Using a data set that includes every oversight hearing held by the U.S. House between 1995 and 2007, we find evidence that congressional committees are sensitive to the number of objections raised by presidents in signing statements. As the president uses signing statements to object to a larger number of provisions in laws, the affected House committees respond with more oversight.

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If legislators are sensitive to coalitional drift, they must perforce be forward looking. In this article, we propose that legislators anticipate change in government-and any associated coalitional drift. That is, legislators recognize that the government could move from unified to divided or divided to unified. As such, how legislators structure an agency's discretion may be affected by the current partisan control of the Congress and the White House as well as their anticipated partisan control. Using U.S. trade legislation data from 1890 to 1990, we find strong empirical evidence that legislators alter agency discretion prior to changes in the political status quo.

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