During his first year in Monticello, Mealey purchased an interest in a
sawmill and opened a
general store. In addition to hardware, groceries, footwear, and carpet, it was at the time the only store in Monticello to sell clothing. He soon sold both businesses and engaged in farming, but bought back into the general store in 1863. Later he developed business interests in a starch factory and a clothespin factory. His son S.J. joined him in running the general store. The elder Mealey forged connections with other influential Minnesotans, selling land to streetcar entrepreneur
Thomas Lowry for a summer home and becoming close friends with railroad magnate
James J. Hill. Active in politics, Mealey served as a
justice of the peace and a
probate judge in
Wright County. Previously identifying as a
Republican, he followed 1872 presidential candidate
Horace Greeley into the breakaway
Liberal Republican Party as he ran for and won election to the
Minnesota House of Representatives. Running thereafter as a
Democrat, he won election the following year to the
Minnesota Senate, serving in the 1874 and 1875 legislatures. He declined a nomination to run again in the 1875 election, but was a delegate to the
1876 Democratic National Convention and returned as a state senate candidate in 1877. He won, but in 1878 Minnesota switched to four-year terms for senators, sending him into another election that November. He was reelected and served through 1882. During his term he was instrumental in passing a new tax code that so improved on prior law it was known as the "iron-clad tax law". ==Personal life==