CREATE TABLE table_42000 ("District" FLOAT, "Incumbent" CLOB, "2008 Status" CLOB, "Democratic" CLOB, "Republican" CLOB)

Which incumbent's democratic candidate was mike carroll?
SELECT "Incumbent" FROM table_42000 WHERE "Democratic" = 'mike carroll'
SELECT "Incumbent" FROM "table_42000" WHERE "Democratic" = 'mike carroll'