"This article studies exponential families $mathcal{E}$ on finite sets such that the information divergence $D(P|mathcal{E})$ of an arbitrary probability distribution from $mathcal{E}$ is bounded by some constant $D>0$. A particular class of low-dimensional exponential families that have low values of $D$ can be obtained from partitions of the state space. The main results concern optimality properties of these partition exponential families. Exponential families where $D=log(2)$ are studied in detail. This case is special, because if $D<log(2)$, then $mathcal{E}$ contains all probability measures with full support."