user: ### NOW ANSWER:
Question: Name the explanation for Alben W. Barkley
Columns: ['Rank by time in office', 'Order in office', 'Vice President', 'Length of term in days', 'Explanation']
Types: ['real', 'real', 'text', 'real', 'text']
Sample row: [1.0, 6.0, 'Daniel D. Tompkins', 2922.0, 'Served two full terms.']
SQL:

assistant: SELECT "Explanation" FROM "Table" WHERE "Vice President" = 'Alben W. Barkley';