CREATE TABLE table_27306 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Name the number of district for tom marino
SELECT COUNT("District") FROM table_27306 WHERE "Incumbent" = 'Tom Marino'
SELECT COUNT("District") FROM "table_27306" WHERE "Incumbent" = 'Tom Marino'