CREATE TABLE table_18660 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

What is the name of the candidate where the incumbent is named James P. Buchanan?
SELECT "Candidates" FROM table_18660 WHERE "Incumbent" = 'James P. Buchanan'
SELECT "Candidates" FROM "table_18660" WHERE "Incumbent" = 'James P. Buchanan'