US Politics Videos and Pictures: Romney Overshadowed by Clint Eastwood's "Empty Chair" Speech

Mitt Romney formally accepted the Republican nomination for President on Thursday night, but his speech was overshadowed by an opening act. Clint Eastwood gave a performance --- thrilling to many at the Convention but bizarrely comic for many viewing via television and the Internet --- in which he addressed an invisible Barack Obama in a chair next to him:

Eastwood's speech has already spawned a series of posters mixing humour and observation....

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