Support for the proposed Keystone XL pipeline appears to be increasing among liberals who live near the project's expected route, according to a new analysis of Pew Research Center surveys in 2013 and 2014.

Researchers Timothy Gravelle of the University of Essex and Erick Lachapelle of the University of Montreal used a "geocode" tool to identify survey respondents and measure the distance of their zip codes from the projected pipeline route.

"Proximity to the pipeline leads to a greater likelihood of favoring the pipeline," Gravelle and Lachapelle said, describing the result as an "inverse NIMBY effect," according to the Washington Post.

"The result suggests that anti-pipeline advocates may be losing the framing war to those who endlessly cite the pipeline's alleged economic benefits," the Post's Chris Mooney said.