Obama's gestures during Mandela memorial scrutinized

U.S. President Barack Obama (L) shakes hands with Cuban President Raul Castro

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An unexpected handshake. A selfie. A seat change.

President Barack Obama's gestures at Nelson Mandela's memorial service in Johannesburg were widely scrutinized on the world's stage Tuesday.

First, Obama shook hands with Cuban President Raul Castro as the U.S. president approached the podium at the soccer stadium to address Mandela's mourners. The brief exchange, captured on video and photographs, sparked an immediate reaction online and on TV, with cable news pundits and Twitter users debating the significance of warmth shown between leaders of countries that have not had formal diplomatic relations since 1959.

The handshake also drew some sharp GOP criticism. Sen. John McCain likened it to shaking hands with Adolf Hitler. (Yahoo News)

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