  The Concealed Voter Model (CVM) is an extension of the original Voter Model,
where two different opinions compete until consensus is reached. In the CVM,
agents express an opinion not only publicly, they also hold a private opinion,
which they may disclose or change. In this paper I derive the critical
exponents of both models via renormalised field theory and show that both
belong to the compact directed percolation universality class.
