Voters shook up the political landscape, setting up a runoff between right-wing firebrand Abelardo De La Espriella and leftist Iván Cepeda.

Senator Ivan Cepeda is leading two right-wing rivals in the first round of an election dominated by security concerns.

Leftist senator Iván Cepeda, candidate of the ruling Pacto Histórico coalition, was leading on Sunday in the early bulletins of the count in the first round of Colombia's…