From 1929 to 1940, Rush represented the 24th district, which at the time included Taylor, Wood, and Clark counties.
[6] Rush was district attorney of Clark County, Wisconsin from 1911 to 1918 and was a delegate to the 1928 Republican National Convention.
[8][9] In 1931, Rush was chosen as chairman of the legislative interim committee on banking.
[10] In January 1937, Rush narrowly won the post of president pro tempore of the Senate, with a vote of 17–16.
[11] In 1937, Rush also served as chairman of the Senate committee on corporations and taxation.