@article{Zittel2018,
  author    = {Thomas Zittel},
  title     = {The dark and bright sides of party polarization},
  journal   = {Items \& issues},
  volume    = {72},
  number    = {February 20, 2018},
  url       = {https://items.ssrc.org/democracy-papers/the-dark-and-bright-sides-of-party-polarization},
  year      = {2018},
}