- a loquacious pundit turned talking head that details how inevitable the event was after the event occurs, usually with hindsight bias.

- retroactive forecaster
The collapse of Lehman Brothers brought out the Trailing Experts and their told-you-so punditry.

Cable networks fill their voids with Trailing Experts seemingly spawned by the woodwork as after-the-fact Cassandras.
by koolmeme January 27, 2010
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