Yes, I can document AZ Obama signature. It has been on FreeRepublic dozens of times and can be found at http://moniquemonicat.files.wordpress.com/2008/arizona-election-nomination-papers-barack-obama.
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I am not computer literate. LOL Here is the correct link
http://moniquemonicat.files.wordpress.com/2008/12/arizona-election-nomination-papers-barack-obama-signed-statement-he-is-a-natural-born-citizen2.pdf