Bolivia, Oct. 21 -- President Evo Morales led in early returns from the first round of Sunday's presidential election, but he appeared to have failed to get enough votes to avoid a runoff in the tightest political race of his life.

The Andean country's top electoral authority said Sunday night that a preliminary count of 84% of the votes showed Morales on top with 45.3%, followed by 38.2% for his closest rival, former President Carlos Mesa. If the results hold, the two men will face off in December and Morales could be vulnerable to a united opposition in the first runoff in his nearly 14 years in power.

Mesa told supporters shortly after the first results were announced that his coalition had scored "an unquestionable triumph," and he ...