{
  "alt": "County map of the United States for each presidential election from 1992 to 2024. In 1992 counties where the House and presidential winners differ are scattered across the South, the Midwest and the West. In 2024 almost every county in the sample has the same winner for both offices. The Senate view shows the counties of states with a Senate race.",
  "caption": "In 1992 counties of both kinds are spread across the map, in the South and outside it; by 2024 nearly every county in the sample has the same winner for both offices. A county in the sample is colored by its two winners: neutral when the same party won both, blue when a Democrat won the House vote in a county the Republican carried for president, red for the reverse. Move the slider to change the election.",
  "data": [],
  "id": "county_map",
  "notes": [
    "Full counts of votes, so the county series have no sampling interval.",
    "Only counties in the main sample are colored: contested races in every district part, totals screen passed. Counties in uncontested races, in states without a Senate race (Senate view), counties with no usable returns and Jackson County, Missouri, from 2004 to 2024 (the file omits the part in Kansas City) draw as no data. Alaska and Hawaii are not in the county file. The South is the Census Bureau's South region."
  ],
  "source": "County returns for President, U.S. House and U.S. Senate, 1992-2024 (Heideman 2026, with MIT Election Data and Science Lab presidential returns); full counts, unweighted",
  "spec": {
    "fips": "fips",
    "frame": "year",
    "frames": [
      1992,
      1996,
      2000,
      2004,
      2008,
      2012,
      2016,
      2020,
      2024
    ],
    "legendLabel": "Winners of the presidential and House vote",
    "payload": "divided_counties.json",
    "scale": {
      "categories": [
        {
          "color": "muted",
          "label": "Same party won both",
          "value": "same"
        },
        {
          "color": "dem",
          "label": "Republican won for president, Democrat for the House",
          "value": "rep_dem"
        },
        {
          "color": "rep",
          "label": "Democrat won for president, Republican for the House",
          "value": "dem_rep"
        }
      ],
      "type": "categorical"
    },
    "tooltipKeys": [
      "pres_margin",
      "house_margin"
    ],
    "tooltipLabels": {
      "house_margin": "House margin (points)",
      "pres_margin": "Presidential margin (points)",
      "senate_margin": "Senate margin (points)"
    },
    "value": "house"
  },
  "subtitle": "Counties by the party that won the presidential vote and the party that won the House vote, counties in contested House races, each presidential election from 1992 to 2024",
  "title": "Counties with different presidential and House winners were spread across regions in 1992, {fact:house_south_1992} of the South's counties and {fact:house_rest_1992} of the other regions' counties",
  "type": "county-map",
  "views": [
    {
      "id": "house",
      "label": "House"
    },
    {
      "caption": "The Senate view colors the counties of states with a contested regular Senate race; counties in other states draw as no data. In 1996 the counties where a Republican won the Senate vote and a Democrat the presidential vote outnumber the reverse, and in 2024 the reverse kind outnumbers the first. Move the slider to change the election.",
      "id": "senate",
      "label": "Senate",
      "spec": {
        "legendLabel": "Winners of the presidential and Senate vote",
        "scale": {
          "categories": [
            {
              "color": "muted",
              "label": "Same party won both",
              "value": "same"
            },
            {
              "color": "dem",
              "label": "Republican won for president, Democrat for the Senate",
              "value": "rep_dem"
            },
            {
              "color": "rep",
              "label": "Democrat won for president, Republican for the Senate",
              "value": "dem_rep"
            }
          ],
          "type": "categorical"
        },
        "tooltipKeys": [
          "pres_margin",
          "senate_margin"
        ],
        "value": "senate"
      }
    }
  ],
  "width": "full"
}