According to Al Jazeera:
Jose Miguel, president of the Institute of Legal Medicine, told Al Jazeera: "The most worrying thing is the intolerance and deep divisions within the population, so the biggest challenge for the new government is to reduce this polarisation.
"John F Kennedy’s phrase about how you can win with half the people's votes but cannot govern with half against you, is particularly true in our country."
Many people on Facebook and on Twitter have posted it, translated to Spanish as:
Se puede ganar con la mitad, pero no se puede gobernar con la otra mitad en contra
Did Kennedy say this?