in 2005 the San Francisco Bay Times reported a pol in new Zealand that found that New Zealanders opposed the nations new gay-inclusive civil-unions

in 2005 the San Francisco Bay Times reported a pol in new Zealand that found that New Zealanders opposed the nations new gay-inclusive civil-unions law by a 3-1 ratio This poll was a call-in-poll that cost $1 to participate in. The San Francisco bay times article also reported that a scientific polling organization found that New Zealanders favor the law by a margin of 56.4% to 39.3%. Explain to someone who knows no statistics why the two polls can give such widely differing results and which poll is likely to more reliable.