What was Elvis' most successful song to not hit Number One?

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Request for Question Clarification by efn-ga on 14 Feb 2005 20:05 PST

Elvis had four songs that peaked at number 2 on the Billboard chart. 
Would a list of those be a satisfactory answer?  It might be difficult
to find out which of them sold the most.

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Clarification of Question by jefffromgreen-ga on 15 Feb 2005 04:01 PST

Actually, he had (at least) five that peaked at number 2. (See
http://www.booksmatter.com/b0823076954.htm )  I'd rather see a list of
best sellers to compare the lists.  Thanks anyway!

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Clarification of Question by jefffromgreen-ga on 23 Feb 2005 11:47 PST

The answer is Return to Sender