The reason why Mayavati is forced to support a UPA/CONgress candidate is because..she is caught in the TAJ case and if she does not listen to SONIA...she will be prosecuted..now look Sonia has stopped her prosecution by instructing the Governer to stop the CBI...
Poor Sibu Soren...had he won the elction in Jharkhand..he would be a central minister..SONIA would have saved him also...
This shows how much SONIA controls the indian politics..