Udall outscores Reagan (in the popular vote), and Reagan outscores Rockefeller. However, election is sent to the House where Udall wins because of a Republican split.
I believe they need a majority of the house (although Dems were a very substantial majority in '76).
And they would need a majority of the states' delegations, not a majority of the House as a whole.
True, but isn't that what the House is? Each delegation has one representative. So it basically does boil down to the House determining the outcome.