 FiveThirtyEight gives the firm a "C+" rating, reporting it had a 3.9 point bias in favor of Republican candidates in the 2010 midterm election.The company's frequent divergence from results reported by other polls has been attributed to its use of Likely Voters, rather than Registered Voters or All Adults, in its survey panels.Surveys by the company are conducted using a combination of automated public opinion polling involving pre-recorded telephone inquiries and an online survey.