Are the Obama's NOT welcome at the upcoming royal nuptials between Prince William and Kate Middleton at Buckingham Palace or is this all part of security concerns?

According to The Daily Mail, the Queen invited 40 heads of state via gold-embossed invitations for the April 29 wedding at Westminster Abbey. Leaders from countries such as Australia, Canada and New Zealand were invited, along with Kings and Queens across Europe such as Spain, Sweden, Norway, Denmark and Greece.

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