After reports that the USS Maddox had been attacked by North Vietnamese naval vessels, the U.S. House of Representatives voted 422-1 to authorize military action in Vietnam. Eugene Siler was the loan 'Nay' vote.
Visualize the 117th House and its members, and compare it with past congresses
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.
The Senate's attempt to repeal the Affordable Care Act narrowly failed due to a surprise defection by Sen. John McCain
Visualize the first time in history a cabinet nominee's confirmation ended in a tie.