Both Brandom and Žižek recognize what Brandom has called the “world’s stubborn recalcitrance to mastery and agency”, and yet hold out for the possibility of transformative action.
Brandom ingeniously secures the practical reality of choice through the indirect route of an Enlightenment idea that we can only be bound by values to which we have at least implicitly committed ourselves. The recalcitrance of the Real prevents this from becoming a subjectivism, specifically by virtue of his complementary thesis that the meaning of our commitments is not up to us. But actively taking responsibility for things beyond our power turns out to indirectly have a kind of efficacy. Retrospectively, this may change meant reality.
A lengthy article by Fabio Vighi and Heiko Feldner discusses agency in Žižek from various angles. This account at least is happily free of the Badiouian narrowing of consideration to a few inflationarily conceived “exceptional” acts that afflicts some of the Žižekians (see “Hard” Kantianism?). The concern is with acts in general, and subjectivity in general. Here I can find a good deal more common ground.
For Žižek, our desires are not our own, but the split in the subject that makes us never fully ourselves also connects us with the social. A subject is contrasted with subjectivation. Although passive, alienating subjectivation is inescapable, it also can never be complete. A subject is positively constituted by its own nonidentity or “impossibility” (i.e., impossibility of complete identity with itself). According to Vighi and Feldner, “this decentred kernel of otherness embodies my self-consciousness, the only place where I have a chance to locate the truth about myself”. The conscious activity of individuals is said to be not free, but we can nonetheless accomplish a free act through identifying with the destabilizing effect of what is “in us more than ourselves”. They argue that Žižek does not hypostatize an abstract negativity in the way that I think Sartre did.
Žižek himself wrote that “To ‘pass to the act’ means to assume the risk that what I am about to do will be inscribed into a framework whose contours elude my grasp” (Tarrying with the Negative, p. 31). This connects agency with the Lacanian Real. He also wrote that freedom corresponds to “my ability to choose/determine which causes will determine me. ‘Ethics’, at its most elementary, stands for the courage to accept this responsibility” (The Parallax View, p. 203).
So, despite huge differences in approach and terminology and Žižek’s negative comments about Brandom, on this question at this level of abstraction, there is a similar practical import.