Through all of Hillary Clinton's recent troubles — emails, foundation, Benghazi — Democrats have taken comfort in their all-but-assured nominee's formidable lead over top Republicans in head-to-head matchups. Now that lead is shrinking, and the Democratic comfort level is falling along with it.
But it's possible Clinton's big lead was never as big as Democrats thought. Yes, some of the margins looked enormous:
* A CNN poll in March showed Clinton up by 15 points over Republican Jeb Bush, 13 points over Marco Rubio, 11 points over Rand Paul, and 15 points over Scott Walker.
* An ABC News poll in March showed Clinton up by 15 points over Rubio, 14 points over Walker, and 13 points over Bush.
* A CNN poll in April showed Clinton up by 22 points over Walker, 19 points over Paul, 14 points over Rubio, and 17 points over Bush.
Big margins. But at the same time, at least one other poll — by Public Policy Polling, the Democratic polling firm — showed Clinton with much more modest leads over her GOP rivals. A PPP survey in late February showed Clinton with an eight-point lead over Walker, a seven-point lead over Rubio, a seven-point lead over Paul, and a 10-point lead over Bush.
A PPP poll at the end of March showed Clinton with a four-point lead over Walker, a four-point lead over Paul, a three-point lead over Rubio, and a six-point lead over Bush — at a time the other polls showed Clinton far ahead of those rivals.
"I am definitely skeptical that Clinton was ever really up by 15 points like some of the early polls were showing," says PPP director Tom Jensen. The reason for those big leads, Jensen suggested in an email conversation, might have more to do with the other polls' methods rather than any overwhelming Clinton advantage.
We use tighter controls on who we call for our polls than most national surveys do. Although we don't do an actual likely voter screen this far out, we do pull lists based on people who have voted in at least one of the last three elections. So I think we end up with samples that are a little bit more conservative than if we were calling all adults or even just registered voters with no respect to voting history.
If Jensen and PPP are correct, then the core assumption of much political analysis in the last few months was little more than irrational exuberance. Now that Clinton is returning to earth in other polls as well — PPP has a new poll out in about 10 days — the question will be how Democrats react to the realization that there once-inevitable shoo-in president might not be an inevitable shoo-in after all.
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