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In the context of the passage, what makes for a random sample poll?"Some may wonder how a survey of just a few hundred or few thousand people can capture the sentiment of voters in a statewide or national election. The polling pioneer, George Gallup, had a ready response: You need only a few drops of blood, not several quarts, to pertorm an accurate blood test.The key, of course, is obtaining a representative sample; that's where things get tricky and can easily go sideways."What makes a poll valid? It's that a sample is random," said Mark Mellman, a Democratic pollster with extensive experience in California and the West."

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