CREATE TABLE table_37610 ("Date" CLOB, "Opponent" CLOB, "Score" CLOB, "Loss" CLOB, "Attendance" FLOAT, "Record" CLOB)

What is the attendance of the game that has the opponent of The Nationals with a record of 68-51?
SELECT SUM("Attendance") FROM table_37610 WHERE "Opponent" = 'nationals' AND "Record" = '68-51'
SELECT SUM("Attendance") FROM "table_37610" WHERE "Opponent" = 'nationals' AND "Record" = '68-51'