How come she's allowed to say this... oh, I see.

From the BBC:

The Conservatives failed to win an overall majority at the general election because of electoral fraud, Baroness Warsi has said. The party chairman told the New Statesman that Labour benefited from the alleged fraud. She said it happened with at least three seats but would not say where.

A Labour spokesperson said the allegations were "unsubstantiated" and urged Lady Warsi to share any evidence she had with the authorities. Lady Warsi said: "It is predominantly within the Asian community."
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UPDATE, re JuliaM's comment, they are all at it, here are the top five Google hits in no particular order. As you will see, a disproportionate number of the guilty parties appear to have 'Asian' names:

Conservatives.
Labour
Lib Dems and Labour
Labour
Conservatives