CREATE TABLE table_52879 ("Date ( s )  conducted" TEXT, "Cons" TEXT, "Plaid Cymru" TEXT, "Lib Dem" TEXT, "UKIP" TEXT, "Green" TEXT, "Others" TEXT, "Lead" TEXT)

On 5 May 2011, what was the lead percentage?
SELECT "Lead" FROM table_52879 WHERE "Date(s) conducted" = '5 may 2011'
SELECT "Lead" FROM "table_52879" WHERE "Date(s) conducted" = '5 may 2011'