user: Question: What si the total sample size at rasmussen reports when the margin of error was bigger than 4.5?
Columns: ['Poll Source', 'Sample Size', 'Margin of Error', 'Date', 'Democrat', 'Republican']
Types: ['text', 'real', 'real', 'text', 'text', 'text']
Sample row: ['Quinnipiac', 1697.0, 2.4, 'Mar 19-24, 2008', 'Hillary Clinton', 'John McCain']
SQL:

assistant: SELECT SUM("Sample Size") FROM "Table" WHERE "Poll Source" = 'rasmussen reports' AND "Margin of Error" > 4.5;