CREATE TABLE table_23636 ("Rank by time in office" FLOAT, "Order in office" FLOAT, "Vice President" CLOB, "Length of term in days" FLOAT, "Explanation" CLOB)

Name the explanation for alben w. barkley
SELECT "Explanation" FROM table_23636 WHERE "Vice President" = 'Alben W. Barkley'
SELECT "Explanation" FROM "table_23636" WHERE "Vice President" = 'Alben W. Barkley'