CREATE TABLE table_21774 ("District" FLOAT, "Incumbent" TEXT, "2008 Status" TEXT, "Democratic" TEXT, "Republican" TEXT, "Independent Green" TEXT, "Libertarian" TEXT, "Other Party" TEXT)

Who was the democratic candidate when the republican was frank wolf?
SELECT "Democratic" FROM table_21774 WHERE "Republican" = 'Frank Wolf'
SELECT "Democratic" FROM "table_21774" WHERE "Republican" = 'Frank Wolf'