Legislators must decide when, if ever, to cosponsor legislation. Scholars have shown legislators strategically time their positions on salient issues of national importance, but we know little about the timing of position-taking for routine bills or what this activity looks like in state legislatures. We argue that legislators’ cosponsorship decision-making depends on the type of legislation and the partisan dynamics among the current cosponsors. Members treat everyday legislation as generalized position-taking motivated by reelection, yet for key legislation, legislators are policy-oriented. With a new dataset of over 73,000 bills introduced in both chambers of the Texas state legislature in the 75th to 86th regular sessions (1997–2020), we use pooled Cox proportional hazard models to evaluate the dynamics of when legislators legislate, comparing all bills introduced with a subset of key bills. The results show that legislators time their cosponsorship activity in response to electoral vulnerability, partisanship, and the dynamics of the chamber in which they serve.
