How did a new breed of "precision pollsters" in 2012 markedly alter the way established firms conducted polling?
A)By focusing on trends of only a few groups, especially in the swing states, to accurately predict an Obama win in both the popular vote and the Electoral College.
B)By focusing on trends in various groups, especially in the non-swing states, to accurately predict an Obama win in both the popular vote and the Electoral College.
C)By focusing on trends in various groups, especially in the swing states, to accurately predict an Obama win in both the popular vote and the Electoral College.
D)By focusing on trends in Democratic groups, especially in the swing states, to accurately predict an Obama win in both the popular vote and the Electoral College.