http://fivethirtyeight.com/features/election-update-clintons-post-convention-bump-is-holding-steady/Clinton's Convention Bump showing no signs of FadingBy Harry Enten
August 8, 2016
Hillary Clinton’s post-convention polling surge is showing no signs of fading. She leads Donald Trump, on average, by about 8 percentage points in national polls, and is an 83-percent favorite to win on Nov. 8, according to our polls-only model. Our polls-plus model — which accounts for the “fundamentals,” as well as the tendency for a candidate’s numbers to temporarily rise after his or her convention — gives her a 76 percent chance. Those are her largest advantages since we launched our election forecasts back in June.
Clinton’s chances were buoyed by strong numbers in both national and state polling released over the weekend:
A new ABC News/Washington Post national poll published on Sunday showed Clinton up 8 percentage points among registered voters. Clinton’s lead jumped 4 points compared to the previous ABC News/Washington survey, conducted before the conventions.
A Morning Consult poll, also published Sunday, also found Clinton up 8 points among registered voters. Clinton was up 5 percentage points in the same poll last weekend, conducted after both conventions. That is, Clinton’s post-convention surge has continued in Morning Consult’s polling.
Two national tracking polls which have generally shown good numbers for Trump also found Clinton building or holding onto her post-convention bounce. Clinton led by 1 percentage point in the latest USC Dornsife/LA Times survey, and by 6 points in the CVOTER International poll — both matching her largest leads from those pollsters.
The only poll showing any real sign of decay in Clinton’s lead is the Ipsos tracking poll, which had Clinton up 2 percentage points as of Friday, down a few points from earlier in the week. For now, it is an outlier, and most polls have Clinton’s bounce holding or expanding.
The newest state polls have been a little more mixed for Clinton, but they basically tell the same story:
Arizona and Nevada have been pretty close all year, and new YouGov surveys found Clinton down 2 percentage points in Arizona and up 2 points in Nevada.
Clinton notched an 11-percentage-point edge in Michigan in an EPIC-MRA survey.
And she led Trump by 12 points in a new YouGov survey of Virginia.
Those are mostly good numbers for Clinton. The question, of course, is whether these results will hold. Convention bounces often fade, and we’re still in a period when we’d expect Clinton’s numbers to be somewhat inflated by her convention.
Our best bet: Wait a couple more weeks to see where the dust settles. Our now-cast, for example, which projects what would happen in a hypothetical election held today, has Clinton winning the popular vote by 8 percentage points. My guess is that that will tick down a couple of points in the coming days. Our polls-plus model, which accounts for convention bounces and so discounts some of Clinton’s recent surge, projects her to win on Nov. 8 by 4 points. And our polls-only model, which basically takes the polls at face-value, projects her to win by 7.
But it’s also possible that Clinton’s strong numbers aren’t solely the result of a fleeting post-convention afterglow. As my colleague Nate Silver pointed out on Friday, Trump’s recent struggles — his attacks on the Khan family and feuds with Republican leadership, for instance — could be inflicting more durable damage to his chances. Trump is the least-liked major party nominee in modern history. Perhaps the conventions and their aftermath, when many voters presumably tuned into the 2016 race for the first time, established a new equilibrium. Perhaps this is 1988 all over again, with the parties reversed.
In 1988, Republican George H.W. Bush, looking to succeed an increasingly popular Ronald Reagan and give his party a third term in the White House, was trailing Democrat Michael Dukakis going into the conventions. But the conventions reset the race. Immediately after the conventions, Bush led Dukakis by an average of about 6 percentage points. In November, Bush defeated Dukakis by 8 points. Now, this year could end up being very different than 1988. Like Bush in 1988, however, Clinton is trying to replace a two-term president from her party whose popularity has been growing.
Still, Trump is an unprecedented candidate, so looking to history is only so useful. My best advice is patience. Clinton clearly has a better shot of winning this election than Trump. Just how much better will become clearer in the next few weeks.
