Question

the problem with early straw polls is that they didnt have one of the following characteristics. which is it?
they werent biased.
they werent chosen by mail.
they were too random.
they werent scientific.

Explanation:

Early straw - polls were informal and lacked scientific sampling methods and rigor. They often had biases and were not representative. Being non - scientific was a major drawback.

Answer:

They weren't scientific.