I want to plot multiple data using data from a column as series.

For example, my raw data:

```
Date,       SomeName,   SomeData
2015-1-1,   Vancouver,  1.1
2015-1-2,   NYC,        1.2
2015-1-3,   Seattle,    2.1
2015-1-4,   Vancouver,  0.9
2015-1-5,   Seattle,    1.1
2015-1-2,   NYC,        2.1

```

If I were to use Excel, with Pivot Chart, I would choose 'Date' to be X-axis, 'SomeName' to be Series(Legend), and 'SomeData' to be 'Values'.

But how do I do something similar with Pandas.plot module?