Argentina will elect a new president today, likely Cristina Fernandez de Kirchner, the wife of the current president. As WaPo reports, polling indicates an outright win for Fernandez de Kirchner today:

To avoid a second-round runoff, the leading candidate must get either 45 percent of the total vote, or 40 percent with at least a 10-point lead over the runner-up. Most polls are predicting that Fernandez de Kirchner will receive just over 40 percent of the total vote and defeat her nearest rival by as many as 25 points.

WaPo also has a backgrounder available here: Argentina Presidential Elections.

Colombians also go to the polls today to fill local offices. Basic coverage can be found here.