CREATE TABLE table_49263 ("Poll Source" TEXT, "Dates administered" TEXT, "Democrat: Larry LaRocco" TEXT, "Republican: Jim Risch" TEXT, "Lead Margin" FLOAT)

Name the average Lead Margin on november 13-november 19, 2007?
SELECT AVG("Lead Margin") FROM table_49263 WHERE "Dates administered" = 'november 13-november 19, 2007'
SELECT AVG("Lead Margin") FROM "table_49263" WHERE "Dates administered" = 'november 13-november 19, 2007'