The PGA Tour runs the American circuit and plays a leading role in staging World Golf Championship events.

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You make no mention of the alarming population growth in the third world, which plays a leading role in driving emigration.

ECONOMIST: Huddled masses

And of course perspective plays a leading role.

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Every year, it seems some battle-weary team receives an unexpected jolt from a lightly used squad member whose freshness, fitness and hunger plays a central role in leading his club to glory.

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Senators worried the new position of overseeing the military's cyber defense efforts for the Pentagon could blur the lines between Alexander's current civilian role of leading the National Security Agency (NSA), which also plays a role in protecting the nations computer networks by monitoring domestic electronic communications.

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