Came across this* while copy editing:
Ever since the creators of 'I Love Lucy' first broadcasted the program intoThat, in turn, led to the question: What's the past tense of "broadcast"? Is it "broadcasted" or just plain old ed-less "broadcast"?
American homes ...
The answer: Both are correct, but one is a clear favorite.
Three out of three dictionaries prefer the past tense form "broadcast" -- no "ed." But all three -- Webster's New World College Dictionary, American Heritage online, and Merriam-Webster online -- allow both.
The copy editor's rule, of course, is to use the dictionary's preferred definition. So I dropped the "ed."
*As always, the wording has been disguised.