Rudy Giuliani continues to lead New York Democratic senator Kirsten Gillibrand, says a new poll from Siena Research Institute. Giuliani tops Gillibrand by seven points in the Siena poll. In a December 15 Quinnipiac poll, moreover, Giuliani tops Gillibrand by 10 points. Rudy’s favorable rating is at 59 percent in the Quinnipiac poll. Giuliani advisers say the mayor hasn’t decided whether to run for governor or senator or stay out of electoral politics entirely. But these Senate numbers send a clear message: Giuliani could defeat Gillibrand in 2010 and become a powerful critic of the Obama administration from his perch in the United States Senate.