A staunch leftist, Morales was elected in December 2005:
Bolivian President Evo Morales stepped up his nationalization campaign on Saturday by announcing the withdrawal of energy and forestry concessions inside some 20 national parks.reuters 26.Aug.06
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Having leftists around would seem to imply there would be the opposite around, too. And the way it's used would seem to imply that the opposites would be preferable, more decent somehow, more normal. Although geometrically it would be "rightists" and "centrists". It's just that those terms never get used.
So it's "leftists" versus the forces of decency in the world.