Table:
text: United States Senate election in Alaska, 2010
Polling
Polling
Poll_source Dates_administered Joe_Miller_R Lisa_Murkowski_R_write_in_candidate_ Scott_McAdams_D
Public Policy Polling October 30–31, 2010 37% 30% 30%
CNN/Time/Opinion Research October 15–19, 2010 37% 37% 23%
Public Policy Polling October 9–10, 2010 35% 33% 26%
CNN/Time/Opinion Research September 24–28, 2010 38% 36% 22%
Moore Research September 23–27, 2010 43% 18% 28%

Question: If 23% Scott Mcadams (d) for United States Senate election in Alaska, 2010, what data will be maintained?

Question: If 30% is Scott Mcadams (d) percentage in the 2010 US Senate election in Alaska, how many polling sources are there?