Sonia and her lobby have nominated Pratibha Patil fully knowing her past scams.Infact,she wanted a puppet who can dance to her tunes.As Pratibha is involved in deep scandals she cannot go against the wishes of Sonia.This is the real motive of Left and Sonia.Shivraj Patil,Pranab Mukherjee and Karan Singh lacked this 'credentials' according to Left and Sonia. Smart move by Congress.