Scholars have also characterized Mitch McConnell's tenure as Senate Minority Leader and Senate Majority Leader during the Obama presidency as one where obstructionism reached all-time highs. Political scientists have referred to McConnell's use of the filibuster as "constitutional hardball", referring to the misuse of procedural tools in a way that undermines democracy. McConnell delayed and obstructed health care reform and banking reform, which were two landmark pieces of legislation that Democrats sought to pass (and in fact did pass) early in Obama's tenure. By delaying Democratic priority legislation, McConnell stymied the output of Congress. Political scientists Eric Schickler and Gregory J. Wawro write, "by slowing action even on measures supported by many Republicans, McConnell capitalized on the scarcity of floor time, forcing Democratic leaders into difficult trade-offs concerning which measures were worth pursuing. That is, given that Democrats had just two years with sizeable majorities to enact as much of their agenda as possible, slowing the Senate's ability to process even routine measures limited the sheer volume of liberal bills that could be adopted."