  We use a weight-preserving, sign-reversing involution to find a combinatorial
expansion of $\Delta_{e_k} e_n$ at $q=1$ in terms of the elementary symmetric
function basis. We then use a weight-preserving bijection to prove the Delta
Conjecture at $q=1$. The method of proof provides a variety of structures which
can compute the inner product of $\Delta_{e_k} e_n|_{q=1}$ with any symmetric
function.
