Political decoy
A political decoy is a person employed to impersonate a politician, to draw attention away from the real person or to take risks on their behalf. This can also apply to military figures, or civilians impersonated for political/espionage purposes.
The political decoy is an individual who has been selected because of their strong physical resemblance to the person they are impersonating. This resemblance can be strengthened by plastic surgery. Often, such decoys are trained to speak and behave like their "target".
Decoying: theory and practice
The practice of decoying is essentially little different from the profession of celebrity lookalike, in which people mimic famous entertainers whom they resemble. The only difference is that the "lookalike" presents an acknowledged artifice. The decoy must conceal his or her imposture from the "audience".
In 2001, Poland hosted the first-ever doppelganger convention, to which lookalikes from across the country turned up, offering the unlikely spectacle of Joseph Stalin hobnobbing with Elizabeth Taylor. Nearly all the doppelgangers at the event had complemented their resemblance to a famous person by costume.