US election poll tracker: Who is ahead - Clinton or Trump?

Americans will vote on 8 November to choose their next president.
Use our poll tracker to follow the contest between the Democratic contender Hillary Clinton and her Republican rival Donald Trump.
The candidates are back on the campaign trail since holding their third and final presidential debate on 19 October.


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How important are national polls?

It is a tough task to gauge the mood of a nation that is home to more than 300 million people but that does not stop the pollsters from trying.
National polls tend to have a sample size of about 1,000 people or more and can track movement and general opinion pretty well.


lineWhat are the polls like in battleground states?

We have identified 13 states that can be considered battlegrounds in this election.
The map below shows them and which way they're likely to vote based on data collected by polling resource website Real Clear Politics.


Map showing which candidate is ahead in each of the battleground states

If those states stay the same colour (blue for Clinton, red for Trump) through to election day - and both candidates win the remaining states they are expected to - it would be a clear victory for Hillary Clinton.
For Donald Trump to have a chance, he needs to turn Florida and Ohio red and win a few others too.
The latest poll averages in the battleground states are shown in the chart below. Some states are polled more frequently than others; not all the polls below will be showing a result from the same survey period.


Image captionBattleground polls: Arizona: Clinton 41 Trump 41; Colorado: Clinton 46 Trump 37; Florida: Clinton 46 Trump 43; Georgia: Clinton 41 Trump 46; Iowa: Clinton 38 Trump 42; Michigan: Clinton 44 Trump 33; Nevada: Clinton 45 Trump 41; New Hampshire: Clinton 43 Trump 40; North Carolina: Clinton 46 Trump 43; Ohio: Clinton 44 Trump 45; Pennsylvania: Clinton 47 Trump 40; Virginia: Clinton 45 Trump 36; Wisconsin: Clinton 45 Trump 38 - (18/10/2016)Each state shows a rolling average and some will be over a longer period of time than others
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Are Trump and Clinton the only candidates?

No. They are the only candidates that stand a real chance of winning the race but there are also third-party and independent candidates in the running.
The rules around getting on the ballot differ from state to state but most voters will have two main alternatives to Hillary Clinton and Donald Trump.


Graph to show four way poll average. Source: RealClearPolitics four-way poll average
Green Party candidate Jill Stein, 66, is a doctor and activist who is hoping to pick up Democrats who backed Bernie Sanders and continue to rally against Mrs Clinton.
Former New Mexico governor Gary Johnson, 63, is standing for the Libertarian Party and focusing his efforts on attracting Republicans uneasy with Mr Trump.
According to Real Clear Politics, Mrs Stein is picking up about 2% of the vote in a four-way race while Mr Johnson is faring slightly better at a little more than 7%. Neither can win the race with stats like that, but they could siphon enough voters off the major candidates to change the outcome in a close race.


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How are Clinton's numbers looking?



Hillary Clinton attends a 9/11 memorial service in New York - 11 September 2016Image copyrightAP

Hillary Clinton has long been the frontrunner in this contest but there have been times where she has looked far from comfortable. The most recent examples came back to back in early September.
First, she made headlines by labelling half of Donald Trump's supporters a "basket of deplorables", allowing her rival to conclude it was evidence of her disdain for "hardworking people".
Then just two days later, Mrs Clinton was filmed fainting after leaving a 9/11 memorial service early. It later emerged she had been suffering from pneumonia, fuelling further rumours about her health - rumours that some of her critics have been pushing for months.
Her poll numbers took a noticeable hit in the days that followed but they appeared to recover towards the end of September.


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When was Trump last ahead?



Donald Trump speaks at the Republican National Convention in Cleveland - 21 July 2016Image copyrightAP

The Republican candidate has made substantial gains on Mrs Clinton since her leads of about 20% in the summer of 2015 (when the field was far wider) but he has only crept ahead of her a few times.
The last came after the Republican National Convention at the end of July when Mr Trump officially accepted the party's nomination.
The lead did not last long, though, with his rival receiving a similar boost to her ratings at the end of the Democratic National Convention a few days later.


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How did the VP picks affect the polls?

In the past, an astute pick for a candidate's running mate could earn them a double-digit boost in the polls - Bill Clinton got a 12-point bounce after naming Al Gore as his pick for vice-president in 1992.
But in recent years the bounces have been far smaller, and 2016 followed that trend.
Neither Trump's choice of Indiana Governor Mike Pence (15 July), or Clinton's unveiling of ex-Virginian governor Tim Kaine (22 July) changed much in the polls.
Source: BBC