As the campaign manager for your local congressional race, you hired Polimetrics, Inc. to conduct a survey to gauge voter support for your candidate. PI conducted a survey involving a random sample of registered voters. The interviewer asked who they would vote for if the election were held today. PI found 47% of the sampled voters support the candidate. You may have noticed that in major national polls, news services report margins of error (half length) around 3%. What sample size is needed in order to retain the 95% confidence level with a half-length of 0.03?