D3 Examples - 2012 US Election result by counties

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
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  <title>US 2012 elections by zipcode</title>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
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​
​
<style>
  .tract {
    stroke: #777;
    stroke-width: 0.05px;
    pointer-events: all;
  }
  .tract:hover {
    stroke: orange;
    pointer-events: all;
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  }
  .tract-border {
    fill: none;
    /*stroke: #777;*/
    stroke-width: 0.05px;
    pointer-events: none;
  }
  @media (max-width: 767px) {
    .label {
      transform: rotate(-45deg) translate(-10px, 25px);
    }
  }
  .tract-border-state {
    fill: none;
    stroke: #333;
    stroke-width: 0.5px;
    pointer-events: none;
  }
  .legend {
    font-family: sans-serif;
    font-size: 10pt;
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  }
  .legendTitle {
    font-weight: bold;
    font-size:11pt;
  }
  .background {
    fill:#f5f5f5;
  }
  body {
    background: #f5f5f5;
    /*font-family: sans-serif;*/
  }
  .bar {
    font-family: sans-serif;
    font-size: 8pt;
  }
  #cityLegend {
    font-family: sans-serif;
    text-anchor: middle;
  }
  #details .background {
    fill: #f5f5f5;
    fill-opacity: 0.7;
  }
  svg {
    width:100%;
  }
</style>
</head>
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<body>
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<div class="row">
  <div class="col-md-1 col-xs-1"></div>
  <div class="col-md-10 col-xs-10">
    <h4>Click on the map to explore</h4>
  </div>
</div>
    <svg ></svg>
</div>
​
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<script src="https://cdnjs.cloudflare.com/ajax/libs/d3-legend/2.11.0/d3-legend.min.js"></script>
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  ga('send', 'pageview');
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</body>
    