The super majority, 2/3rd vote, is a Senate rule that is contrary to the will of the writers of the Constitution. They made it abundantly clear in eight years of contentious negotiating, that simple majority was the means of passing legislation and that the 2/3rd vote was needed only to approve treaties and overturn vetoes. The Senate blatantly acts contrary to the will of the framers.
3/5, not 2/3 of the senate is required to pass this kind of bill (unless the gop goes nuclear and changes the rules). Here is another fun fact: without the 3/5 rule, the senate would have passed amnesty and GW Bush would have signed it into law.