A very important quality of a sample survey is its margin of error. The margin of error should always be available for a good statistic. If it is not given, it may be too large to be trustworthy, or the sample was not randomly selected. These problems undermine the validity of the statistic. Unfortunately, the answer is no.
Some people use unethical methods to create a statistic that says what they want it to say.
Your best bet is to be an informed reader and to always carefully question and analyze each statistic that you encounter. For each of the counties in our sample, we estimate how many voters will vote on election day. This is for both statistical and practical purposes. For instance, we use these estimates for choosing which voting precincts, or more specifically, which polling places to include in our sample. We designed our sample so that polling places with more expected voters are more likely to appear in the sample.