Final - Part 1

Using the code in http://bl.ocks.org/mbostock/4090848 plot a red circle on DC

Step 1. Change

d3.json("/mbostock/raw/4090846/us.json", function(error, us) {

to

d3.json("https://gist.githubusercontent.com/mbostock/4090846/raw/us.json", function(error, us) {

Step 2. Add the following

var loc = projection([-77.0164, 38.9047]);
svg.append("circle")
    .attr("cx", loc[0])
    .attr("cy", loc[1])
    .attr("r", 10)
    .style("fill", "red");