LA PAZ, Oct. 20 (Xinhua) -- Bolivia's Movement Towards Socialism (MAS) led Sunday's presidential race with 50.38 percent of the votes, with 62 percent of ballots counted, the Supreme Electoral Tribunal (TSE) said on Tuesday.
As of 12:30 p.m. local time (16:30 GMT), the Citizen Community (CC) party's candidate Carlos Mesa trailed in second place, with 31.69 percent of the votes.
The TSE's official results showed a considerable gap between the MAS' Luis Arce and Mesa.
The TSE began the official tally on Sunday night and electoral authorities expect to have 80 percent of the ballots tabulated by Tuesday night.
According to the electoral calendar, the vote count must take place between Oct. 18 and 24.
To win the first round in Bolivia, and forgo a runoff, a candidate must obtain over 50 percent of the votes, or 40 percent of the votes with a minimum 10-point advantage over the runner-up.