Your cynical attitude in insisting on seeing the world in black and white continues to astound me.
Let me show you one of the supposed "left-wing" people in Maduro's government, Mr. Luis Vuitton himself, National Assembly deputy Pedro Carreño (remember, that guy who used homophobic slurs some months ago and of which there is plenty of video evidence?), accusing Capriles of being in cahoots with one of the owners of the many chains of stores that are under crackdown by the government for selling products at overloaded prices called Daka:
Turns out that the man in that photo with Capriles was NOT, in fact, the owner of Daka, but rather a Mexican senator, Javier Lozano Alarcón. Javier himself confirmed that that's him in the photograph through his twitter account @JLozanoA. In case you need to use a Chavista website in order to believe that this whole story is true, here's an article by Aporrea.com confirming that the man in the picture with Capriles is indeed Alarcón, and where they actually do talk about the real owner of Daka:
http://www.aporrea.org/actualidad/n239932.html
So what does this show us then? That someone who recognizes himself as a leftist and a hardcore supporter of the Chavista regime is willing to openly lie (poorly, I might add) about their political opponent. Is this what you mean by "principle"? Stop being so fucking close-minded and accept that people from any side of the political spectrum can be lacking of principle, even those who are "left-wing".