We update the data each day based on the weighted average of poll responses over the previous week. That means results have less volatility than some other polls, but also means the poll lags somewhat in responding to major events in the campaign. More about the poll and why it differs from others.
Who would you vote for?
We ask voters what the chance is that they will vote for Trump, Clinton or someone else, using a 0-100 scale. The overall level of support for each candidate reflects the weighted average of those responses.