CREATE TABLE table_28882 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" CLOB, "Result" CLOB, "Candidates" CLOB)

What party did robert p. letcher represent?
SELECT "Party" FROM table_28882 WHERE "Incumbent" = 'Robert P. Letcher'
SELECT "Party" FROM "table_28882" WHERE "Incumbent" = 'Robert P. Letcher'