Need to inflate the balls of 5 more democrats.
With gas at $3.80, perhaps. With gas at $1.99? Not a chance. This is exactly what the Saudis intended.
To total 67, or more than 2/3 of the total number of Senators.
But now my curiosity is tickled: what is required constitutionally, 2/3 of the total number of Senators, or merely 2/3 of those voting? Article I.7.2 just says, "two thirds of [each] House..." I'm betting on the former.