A Dane County judge Wednesday dismissed a ticket against Michael Crute.
The judge found state rules requiring small groups of protesters in the statehouse to obtain a permit were unconstitutional.
The Milwaukee Journal Sentinel reports the ruling has a limited effect because of a settlement in a prior case.
To settle a federal free speech lawsuit, Gov. Scott Walker's administration agreed in October to pay more than $88,000 in attorneys fees and drop its requirement that larger groups protesting in the Capitol receive a permit.
However, the administration and the Wisconsin Department of Justice have continued to pursue outstanding citations issued before the settlement.
The state Justice Department is reviewing the ruling.