emacs paste password, only pastes one character

[John Owens]

OS X 10.8.2, GNU Emacs 24.2.1. 

I read my email in Emacs using the "wanderlust" mailer. I store
passwords in 1Password, and would like to use the "copy" button in
1Password to put the (~20-character) stored password into the
clipboard, then paste it into the request for a password in Emacs. I
have confirmed the clipboard is doing the right thing. However, when I
C-y yank the password from the clipboard into Emacs, it only pastes a
single character. This is annoying; I'd like it to paste the entire
clipboard.

The function that accepts the password is elmo-read-passwd,
http://pastebin.com/3xYGQU5L .

Happy to get any thoughts on how to trick emacs into accepting the
entire password!

JDO