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the buck stops anywhere but his desk = ?

Context:
"The president's shifting explanations and excuses demonstrate, once again, that this president believes the buck stops anywhere but his desk," Kerry said in a statement. He said Bush should act more like former president John F. Kennedy, whose name Bush has invoked lately in seeking crossover votes from Democrats, and "take responsibility for his actions."
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Kerry is accusing Bush of avoiding responsibility. The saying is 'the buck stops here', and the 'buck' was originally a marker in poker (a card game) which indicated the current (or next?) dealer. The saying means that ultimate responsibility resides 'here'; it was made famous by a sign to that effect on President Harry S. Truman's desk, and they are now sold in many office supply shops as a desktop ornament.
Comments  
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Hi there
Speaking of which, in the context of the US election campaign, I heard the
phrase "dead heat". What does it means?
thanks
A 'heat' is a stage of a race, and a 'dead heat' is an extremely close race, virtually tied near its end.