Public space is often understood as an important 'node' of the public sphere. Typically, theorists of public space argue that it is through the trust, civility and openness to others which citizens cultivate within a democracy's public spaces, that they learn how to relate to one another as fellow members of a shared polity. However, such theorizing fails to articulate how these democratic comportments learned within public spaces relate to the public sphere's purported role in holding state power to account. In this paper, we examine the ways in which what we call 'partisan interventions' into public space can correct for this gap. Using the example of the Communist Party of India (Marxist) (CPIM), we argue that the ways in which CPIM partisans actively cultivate sites of historical regional importance – such as in the village of Kayyur – should be understood as an aspect of the party's more general concern to present itself to citizens as an agent both capable and worthy of wielding state power. Drawing on histories of supreme partisan contribution and sacrifice, the party influences the ideational background – in competition with other parties – against which it stakes its claims to democratic legitimacy. In contrast to those theorizations of public space that celebrate its separateness from the institutions of formal democratic politics and the state more broadly, the CPIM's partisan interventions demonstrate how parties' locations at the intersections of the state and civil society can connect the public sphere to its task of holding state power to account, thereby bringing the explicitly political questions of democratic legitimacy into the everyday spaces of a political community.