Clinton Is Leading, It Isn't just Because of a Debate, here's Why?
Polls fluctuate all the time in response to events that dominate the news. Sometimes, this is a result of real changes in the race. For example, once candidates clinch the presidential nomination, they typically pick up same-party supporters who backed one of their rivals in the primaries and caucuses.
Then around the time of the conventions, the nominees add another wave of supporters: those who don’t pay much attention to politics and who use the events as signals to start tuning in and choosing a candidate.
Something in the news that flatters one candidate makes marginal supporters more likely to say they have decided to vote for her or him and more likely to say they will vote, period.
So was the first debate a true game changer?
Probably not.
But a lot of changes in the polls are predictably ephemeral. Something in the news that flatters one candidate makes marginal supporters more likely to say they have decided to vote for her or him and more likely to say they will vote, period. It even makes them more likely to answer a survey in the first place. Similarly, bad news about a candidate, if it dominates media reports, will make marginal supporters less likely to admit they have decided, less likely to claim they are certain to vote, and less likely to answer a survey.

So most of what we’re seeing in long-term polling trendlines isn’t that a bunch of people are changing their minds back and forth. The underlying race can be fairly stable even while the polls fluctuate. That’s why analysts call these fluctuations “bounces” -- they go up and back down fairly predictably.
We don’t really know what “normal” is -- the equilibrium we would observe if the current news environment was relatively neutral.
What we can observe, however, is which news stories are getting plenty of play. And we know there was a run of bad news for Hillary Clinton in mid-September, centered on her comment that many Trump supporters were “deplorables” (reported on Sept. 10) and her bout with pneumonia (Sept. 11). Not only did those stories linger, but they also produced a polling dip, which was a third piece of bad news.
What happened in late September was the natural ebbing of that cycle, combined with a new round of negative stories about Trump.
On the weekend before the first debate, several news articles detailed Trump’s problems with the truth. At the same time, a series of reports by the Washington Post’s David A. Fahrenthold and others about questionable practices involving Trump’s businesses and “charity” foundation entered the news cycle, replacing talk of Clinton’s health and “deplorables.” Several days after the debate, the New York Times ran an article on Trump’s 1990s tax returns.
As I said, we don’t know where the polls would be in a period of relatively neutral news coverage. My guess is that Clinton is leading by something like 4 to 6 percentage points, and has throughout, with most polling surges in both directions short-term aberrations.
But that’s a judgment call; one certainly could argue that the underlying contest is somewhat tighter than this, and that we’ve had more negative cycles about Trump than about Clinton. You could also say that given a candidate with all of Trump’s liabilities, a neutral information environment would feature quite a few negative stories about him, so we need to build that into our expectations.
The bottom line: The first debate didn’t create Clinton’s current lead. So don’t expect the debates on Sunday or the one on Oct. 19 to be the reason if it changes.
Among Seniors, Clinton Grows More Appealing -Wall street Journal
Latest Wall Street Journal poll shows Democrat luring older voters toward her party and away from the GOP

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