The U.S. Senate unanimously voted to pass what would become the 26th Amendment, lowering the voting age to 18.
On March 7th, 1975, in a bipartisan vote, the U.S. Senate voted to amend Rule XXII (which governs the end of debate, and thus filibustering) to lower the threshold for cloture from 67 to 60 votes.
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The Senate's attempt to repeal the Affordable Care Act narrowly failed due to a surprise defection by Sen. John McCain
In 1997, the Senate voted 95-0 to restrict entry of the U.S. into future international climate treaties, ending hopes for legally binding emissions targets for the U.S.
