oppo guy
n. A political operative who specializes in digging up dirt on opponents.

Example Citation:
"There will be knowing looks all around this town if you proffer a spin about White House oppo guys who dug up dish and Borked political opponents to counter the right-wing hitmen who are sliming the president."
—David Goldstein, "Washington-Speak Evidence of Sheltered Life in Capital," The Arizona Replublic

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