Question: What was the weekly rank by Virgin media for the title aired on May 20, 2010?
Schema: create table table_26826304_2 (weekly_rank_virgin_media integer, air_date varchar, PRIMARY KEY (weekly_rank_virgin_media))
SQL: select min(weekly_rank_virgin_media) from table_26826304_2 where air_date = "may 20, 2010"