Jewish World Review Nov. 9, 2000 /11 Mar-Cheshvan 5761
Howard Fienberg and Iain Murray
turn off the TV
Exit polls involve face-to-face polling of voters as they leave the voting booths on election day. For the most part, they are conducted by the Voter News Service (VNS), a consortium of TV networks and the Associated Press, which also sells its data to other news organizations. Traditional telephone polling, when it's not horrendously flawed, nets such low response rates these days (30-40 percent on average) that the simplicity of exit polls is quite refreshing: unlike pre-election polls, there is no difficulty sorting out registered or likely voters, since only confirmed voters are polled. But exit polls rely on a small sample of voting precincts and, like any other survey, can run afoul of non-response or false responses. For example:
Of all the pitfalls in the path of exit polling, the largest is the absentee ballot. In 1993, Washington state first let everyone vote by mail and over half of the state's voters are expected to vote this year by absentee ballot. Voters in Oregon's tight vote this year will vote almost entirely by mail.
In 1996, according to the Associated Press, absentee and early balloting encompassed more than ten percent of the total vote in 18 state, more than 20 percent in nine states, and more than 30 percent in three states. In 1998, the total vote included more than 10 percent in absentee and early ballots in 15 states, more than 20 percent in eight states, more than 30 percent in five states and more than 40 percent in three states. This year, Washington states expects over half of its votes to come via mail, while voters in Oregon will vote almost entirely by mail. This doesn't even take into account the thousands of supremely important ballots cast by Floridians abroad.
Empirical evidence of impact on exit polling arose as early as the 1982 California election, when exit polls predicted Democrat Tom Bradley would defeat Republican George Deukmejian for the governorship and that Democrat Jerry Brown would defeat Republican Pete Wilson for U.S. Senate. Both predictions were wrong because so many Republican voters cast absentee ballots. As restrictions on absentee, electronic and mail ballots lessen, exit poll projections inevitably suffer, since many voters are not available at a real voting booth.
Major news media have agreed not to announce exit poll results for each state until its polls have closed, in order to avoid influencing voters-a principle violated this year by projecting Florida when voters in the panhandle, in the Central time zone, were still in line outside voting booths. But it is still important for us to remember that the results at which journalists are grinning or grimacing during election coverage are not the real deal.
Historically, exit polls have been more reliable than tracking polls
and the news media treat them as gospel. But if the poll result is close,
anyone who tells you that they know who has won is lying. Voters would be
best served not by staying up to watch the back-and-forth volleying of
projection tennis, but by simply going to sleep and letting the results
Howard Fienberg is research analyst and Iain Murray is senior analyst with the Statistical Assessment Service (STATS), a nonprofit nonpartisan organization dedicated to improving public understanding of scientific and social research. You may comment by clicking here.