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The difference between Martin Sheen and George W. Bush is Martin Sheen is actually convincing when he acts like he's president.

"Can Congress Uncover Reasons for Inadequate Intelligence?; Is Church Policy on Abusive Priests Strict Enough?; Is Racial Profiling Fair?". “CNN Crossfire”, www.cnn.com. June 4, 2002.
The difference between Martin Sheen and George W. Bush is Martin Sheen is actually convincing when he acts like he's president.