 After being elected to the Massachusetts House of Representatives in 1910, Lomasney worked with labor leaders on legislation enforcing a 48-hour work week and workmen's compensation, but he opposed their attempts to exclude aliens from their unions.As a state senator, he opposed the construction of Boston's elevated railway.To spite John F. Fitzgerald, Lomasney endorsed Yankee Republican Louis Frothingham for governor in 1911 and delivered 95% of the vote from his ward.