CREATE TABLE table_74003 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" TEXT, "Result" TEXT, "Candidates" TEXT)

What is the party of Joseph Vance?
SELECT "Party" FROM table_74003 WHERE "Incumbent" = 'Joseph Vance'
SELECT "Party" FROM "table_74003" WHERE "Incumbent" = 'Joseph Vance'