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Ivan Duque and Gustavo Petro represent opposite ends of Colombia's political spectrum. And they've presented dramatically different visions for the future of the nation as it moves forward with a historic peace process with leftist rebels. Let's take a look at their political views.
A lawyer and senator, 41-year-old Ivan Duque is the hand-picked candidate of former President Alvaro Uribe. Both oppose the nation's 2016 peace deal with the FARC. Right-winger Duque has promised to toughen the terms of the peace deal and jail former rebels for war crimes.
Leftist Gustavo Petro, a 58-year-old former member of the now defunct M19 rebel group, supports the peace deal.
Duque also promised to reduce corporate taxes, exempt capital goods imports and support the development of oil and mining projects to help reinvigorate growth. But he has been dismissed by many as too young and inexperienced to run a nation of 50 million people with a struggling 324-billion-dollar economy.
Petro has raised alarm among investors with pledges to overhaul Colombia's economic policy. He wants to take power away from the social and political elites he says have dominated Colombia too long. He also promised to fully separate the political and judicial systems, in a bid to strengthen democracy and tackle corruption.
Duque would have an easier time with Congress. Following congressional elections in March, his Democratic Center party has more Senate seats than any other and is in second place in the lower house. Petro's party has only six seats in Congress. He would face an uphill battle to pass legislation.