Table: op_poll_2008_us
Columns: poll_source
sample_size
margin_of_error
date
democrat
republican

Question: What was the sample size for the poll from Nov 9-11, 2007 with a margin of error less than 4.3?
SQL: SELECT MAX("sample_size") FROM op_poll_2008_us WHERE "date" = 'nov 9-11, 2007' AND "margin_of_error" < 4.3

Question: What was the sample size for the poll featuring Republican Ron Paul?
SQL: SELECT "sample_size" FROM op_poll_2008_us WHERE "republican" = 'ron paul'