Dec. 18 (Bloomberg) -- Bolivian Indian activist Evo Morales, who describes himself as the ``United States' worst nightmare,'' won election as president of South America's poorest nation.

Morales, 46, took 51 percent of the vote based on 80 percent of ballots counted, Bolivian station Unitel reported. Ex-President Jorge Quiroga, 45, the second-place finisher, conceded at a press conference in La Paz, Bolivia tonight. Polls had indicated no candidate would win the majority needed for a first-round victory.