Table: alaska_2010_senate_polls
Columns: poll_source
dates_administered
joe_miller_r
lisa_murkowski_r_write_in_candidate
scott_mcadams_d

Question: When 23% scott mcadams (d) what are the dates administered?
SQL: SELECT "dates_administered" FROM alaska_2010_senate_polls WHERE "scott_mcadams_d" = '23%'

Question: When 30% is scott mcadams (d) percentage how many poll sources are there?
SQL: SELECT COUNT("poll_source") FROM alaska_2010_senate_polls WHERE "scott_mcadams_d" = '30%'