Vidal was fielded in the Republican Proposal (PRO) party list as a candidate for a seat in the Argentine Chamber of Deputies for Buenos Aires Province in 2005, though unsuccessfully; she was later elected to the Buenos Aires City Legislature.
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Affiliated with the Republican Proposal party, she was appointed Minister of Social Development of the City of Buenos Aires, and in 2011 was elected Deputy Mayor.
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Subsequently she announced her departure from the party and was confirmed as the lead candidate for National Deputy for the Unión Pro Federal alliance formed by Mauricio Macri's PRO and dissident Peronists.
He has been courted by Mauricio Macri of the centre-right Commitment to Change party, possibly as a candidate to be governor of Buenos Aires Province for the PRO alliance.