I'm from pic related and the Left is in steady decline.
Lula and the Worker's Party started as something that, I think, can be described as analogous to a Bernie Sanders or someone like that. As time went by it started to accept most of our Capitalist system's main characteristics and focus on fixing smaller issues such as welfare, social mobility, hunger, etc. They've been allied with more radical parties, like the Communists, but those have also started to limit their ambitions as the time went by.
On their Left we have the generic "hard-Left" dinosaurs like PSTU, and like all parties in the same vein they never win elections, they are not really influential over any sect of society, and they have a bunch of vague demands that are unrealistic and unpracticable on a legal, economic and political level. You also have the growing PSOL, which embodies the "new" radical Left with an attitude that is probably familiar to most Europeans: a lot of identity politics, moralistic potshots at the main left-of-center parties, stunning naivety when it comes to foreign policy (praised Israel, praised the Ukrainian revolution, Arab spring) and virtually no projects of their own. As some of you probably expect, they're loved by students.
On the rise right now is the PDT, who are center-left and slightly nationalistic. Their programs resemble the Left of the UK Labour a bit: Benn, Skinner, Foot, etc, which is right up my alley. One of their newer members, Ciro Gomes, might become our new president in 2018.
In general, there has never been a left-wing attitude among the population, but people have voted for the Left because the misery was so fucking huge back in the day. The labour, student and minority movements are all a joke, who live up to all the stereotypes of being naive, utopian and economically illiterate that the Right throws at us.