i can't believe that they are stupid enought that they don't get this

King: It’s ‘bizarre’ that Obama will use his middle name when being sworn in.
(Think Progress)
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But i guess they hope the people that are listening are that stupid.
It is vastly different for someone to use their own full name in a formal ceremony and for opponents to highlight just his middle name as a way of smearing him as a suspicious outsider.

Pretty damn basic common sense here - nothing particularly "bizarre".