title: Pandas read_csv usecols same index
body: <p>Consider the following code:</p>
  
  <pre><code>import pandas as pd
  from StringIO import StringIO
  x='''
  a,b,c,d
  1,2,3,4
  5,6,7,8
  9,10,11,12
  13,14,15,16
  17,18,19,20
  '''
  
  df = pd.read_csv(StringIO(x), skipinitialspace=True, usecols=[2,3,2])
  print df
  </code></pre>
  
  <p>Output:</p>
  
  <pre>
      c   d
  0   3   4
  1   7   8
  2  11  12
  3  15  16
  4  19  20
  </pre>
  
  <p>is there any way i can get </p>
  
  <pre>
      c   d    c
  0   3   4    3
  1   7   8    7
  2  11  12    11
  3  15  16    15
  4  19  20    19
  </pre>