Colombia's presidential election has turned into an ugly slugfest featuring accusations of bribes from drug traffickers, spying and email hacking.

That's distracting attention from peace talks with the country's main rebel group, which had been expected to be a key issue going into Sunday's election.

Much of the public feuding is between President Juan Manuel Santos and his still-powerful predecessor, Alvaro Uribe, who opposes the peace talks.

Santos has been attacked relentlessly by Uribe and his hand-picked heir, Oscar Ivan Zuluaga. Polls say the two are running neck and neck, well ahead of three other candidates for Sunday's vote, but with neither likely to garner the 50 percent needed to avoid a runoff.