He was first elected to the Assembly from
Milwaukee County's 11th Assembly district (the 11th
Ward of the City of Milwaukee) in 1904, defeating former Assemblyman
Republican Herman Pomrening by 9 votes in a three-way race, with 1924 votes for Brockhausen, 1915 for Pomrening, and 1163 for
Democrat Charles Miksch. (Democratic incumbent
Frank Haderer, who had ousted Pomrening in 1902, was not a candidate.) Brockhausen was assigned to the
standing committee on
manufactures. He was more easily re-elected in 1906, and remained on what was now the committee on manufactures and
labor. In 1908, with no Republican in the race, he defeated Miksch 1575 to 1288, and moved to the committee on
municipalities. In 1910, with the Socialists sweeping Milwaukee's elections, he won 1983 votes to a total of 998 for his three opponents combined. He moved to the committees on
taxation, on
charitable and
penal institutions, and the newly created committee on workmen's compensation. This session of the Legislature was to see worker's compensation enacted into law in 1911, the first such statute in the United States. == After the Assembly ==