The graffito reflects one of its basic premises: that the right lost the elections because the Socialists and Free Democrats, then in opposition, rigged them.

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Just before closing time the previous day, a 28-year-old woman scrawled the 30cm (12in) graffito on the bottom of the painting and was immediately detained by a museum guard, France's 20 Minutes news website reported.

BBC: Delacroix Liberty painting defaced in Louvre