The move comes after an embarrassing stretch for Gallup in which the firm was widely panned for its 2012 election polls. Soon after the election, Fordham University put the firm near the bottom of its rankings for pollster accuracy. And more recently, MSNBC's Joe Scarborough launched a blistering on-air attack last week against the firm.
Newport responded to the attack in the email to Politico.
"Our review includes a significant amount of new research, including fielding new research experiments focused on six specific areas of pre-election polling, along with simulations and re-examination of every component of the pre-election polling process," Newport wrote. "All of this research, some of it focused on the future of election polling, is one reason why it is taking several months. A number of changes have already been implemented in our on-going tracking, and others will continue to be tested, including experimental tests involving voter sampling and likely voter models."
Newport added in a phone call to Politico that Gallup's changes will include a different method of asking respondents about their race and what he described as a different way of bringing "landline and cellphone users into the sample."
About a month before last year's election, Gallup adjusted the sample of its daily tracking poll to an even split between respondents reached by landline telephones and those reached by cell phones.
But that change did little to improve the accuracy of the organization's results. After shifting to a narrower sample of likely voters, the Gallup tracking poll showed Mitt Romney with solid leads over President Barack Obama in the closing weeks of the campaign -- although the final Gallup poll before Election Day showed the Republican nominee's lead had fallen to only a point.
Weeks after the election, Newport wrote a post on the firm's website in which he defended Gallup's findings and appeared to take a thinly veiled shot at polling aggregators.
"Individual farmers can each make a perfectly rational decision to graze their cows on the town commons," Gallup wrote. "But all of these rational decisions together mean that the commons becomes overgrazed and, in the end, there is no grass left for any cow to graze. Many individual rational decisions can end up in a collective mess."
But its performance in the 2012 election left Gallup with no shortage of critics, including Obama's 2012 campaign manager, Jim Messina. He said Gallup's poor performance was nothing new.
"Gallup has been wrong repeatedly in presidential elections for a long time," he said.