Matt Berninger of The National will open for a President Obama rally Saturday in Des Moines, Iowa. Here, Berninger performs in Brisbane, Australia, in 2011. Mark Metcalfe/Getty Images hide caption

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Sen. Joe Lieberman appears at the Republican National Convention in St. Paul, Minn., in 2008, just eight years after he was the Democratic vice presidential nominee. His appearance is just one of several notable oddities at recent political conventions. Charles Rex Arbogast/AP hide caption

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Never mind the palmetto bugs. There's a lot to like about Tampa, Fla. Mladen Antonov/AFP/Getty Images hide caption

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Republican presidential nominee Mitt Romney on Thursday at the Republican National Convention in Tampa. Spencer Platt/Getty Images hide caption

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Delegates filled the floor Tuesday during the Republican National Convention at the Tampa Bay Times Forum in Tampa, Fla. Win McNamee/Getty Images hide caption

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