user: Question: How many polls show a result where democrat Christine Gregoire was polling at 50% and had a lead margin of 2?
Columns: ['Source', 'Dates administered', 'Democrat: Christine Gregoire', 'Republican: Dino Rossi', 'Lead Margin']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Survey USA', 'November 2, 2008', '52%', '46%', '6']
SQL:

assistant: SELECT COUNT("Source") FROM "Table" WHERE "Democrat: Christine Gregoire" = '50%' AND "Lead Margin" = '2';