What are the invalid ways to conduct a poll according to professional pollsters?

The principle of random sampling, or randomly choosing people for the poll in a manner that draws a diverse sample, is vital to having an accurate poll.

Explanation:

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i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.