title: how do you create a US States heatmap based on some values?
body: <p>I have this data frame called x:</p>
  
  <pre><code>dput(tail(x,20))
  structure(list(State = structure(c(22L, 58L, 2L, 33L, 75L, 16L, 
  26L, 17L, 14L, 76L, 19L, 7L, 1L, 41L, 67L, 31L, 35L, 21L, 20L, 
  69L), .Label = c("Texas", "New York", "Florida", "Illinois", 
  "Georgia", "Kentucky", "Tennessee", "California", "Alabama", 
  "Indiana", "Bayern", "Michigan", "Arizona", "Pennsylvania", "Hawaii", 
  "Ohio", "Oregon", "Nairobi Area", "South Carolina", "Wisconsin", 
  "West Virginia", "New Jersey", "Maryland", "Colorado", "Missouri", 
  "Oklahoma", "District of Columbia", "Minnesota", "Massachusetts", 
  "Louisiana", "Virginia", "Connecticut", "North Carolina", "Ile-de-France", 
  "Washington", "Sichuan", "Arkansas", "Nevada", "Idaho", "Al Balqa'", 
  "Utah", "Maine", "Kansas", "Iowa", "Mississippi", "Ontario", 
  "Montana", "New Hampshire", "Nebraska", "Cordoba", "London, City of", 
  "Cavite", "Armed Forces Europe, Middle East, &amp; Canada", "Ar Riyad", 
  "Quintana Roo", "Zurich", "Lombardia", "New Mexico", "Alberta", 
  "Ho Chi Minh", "Cortes", "Delaware", "Distrito Federal", "Ad Dawhah", 
  "Distrito Nacional", "Arbil", "Vermont", "Toscana", "Wyoming", 
  "Andhra Pradesh", "Puebla", "Marrakech-Tensift-Al Haouz", "Delhi", 
  "Beijing", "North Dakota", "Rhode Island"), class = "factor"), 
      Count = c(152, 3, 926, 20, 1, 167, 26, 25, 51, 1, 6, 13, 
      633, 14, 1, 60, 47, 14, 46, 1), Latitude = c(40.298904, 34.840514, 
      42.165724, 35.630066, 47.52891, 40.388781, 35.565342, 44.57202, 
      40.590752, 41.680893, 33.856893, 35.747845, 31.054487, 40.150032, 
      44.045877, 37.769335, 47.400902, 38.491226, 44.268544, 42.755965
      ), Longitude = c(-74.521013, -106.248483, -74.948052, -79.806417, 
      -99.784012, -82.764916, -96.928919, -122.070939, -77.209755, 
      -71.511782, -80.945011, -86.692343, -97.56346, -111.862433, 
      -72.710689, -78.169968, -121.490493, -80.954452, -89.616509, 
      -107.302488)), .Names = c("State", "Count", "Latitude", "Longitude"
  ), row.names = 30:49, class = "data.frame")
  </code></pre>
  
  <p>I like to be able to create a map heatmap based on State and Count. I used qplot as below, but no map came up:</p>
  
  <pre><code>qplot(Latitude, Longitude, data=x, group=State , fill= Count, geom="polygon")
  </code></pre>
  
  <p>any ideas if I missed something?</p>