Gawd, you are thick.
The president decides whether it takes a simple majority (or a 60 percent majority) to pass a bill, or whether it will take a 67 percent majority.
Well, which is it, a 60 percent majority or a simple majority? It's a 60% majority, which is why the President doesn't change the threshold from 51 to 67, he changes it from 60 to 67. Which is exactly what I said. Which you made an utter fool out of yourself making mock of.
So yes, if there are between 60 and 67 Senators who want an anti-gun bill, Rudy would be bad to have as President. I'll take my chances. Even after the shellacking the GOP took in 2006 it could probably muster 41 votes to block an anti-gun bill, and if Rudy is elected, it'd almost certainly be accompanied by an increased number of Republicans in the Senate thanks to the coattails effect anyway.