GO : Santos : Voters must choose ` ` between the end of the war and a war without end '' NEW : Santos : ` ` My pledge is to work for a serious , responsible and lasting peace '' Colombia 's presidential vote will need a second round to determine a winner . That means Zuluaga and Santos will face off in a runoff election on June 15 . Key question voters are weighing : How should government handle the crisis ?
GO : Santos : Voters must choose ` ` between the end of the war and a war without end '' NEW : Santos : ` ` My pledge is to work for a serious , responsible and lasting peace '' Colombia 's presidential vote will need a second round to determine a winner . Key question voters are weighing : How should government handle the crisis ?