CREATE TABLE table_28948 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

What is the district with the incumbent john nicholas?
SELECT "District" FROM table_28948 WHERE "Incumbent" = 'John Nicholas'
SELECT "District" FROM "table_28948" WHERE "Incumbent" = 'John Nicholas'