He opposed the revolution of the clergy who rejected the religious freedom advocated by Governor Salvador María del Carril.

In 1834 Rawson returned as a deputy, and supported the policy of Governor Martín Yanzón, a Federalist who had good relations with the Unitarians.

He was Yanzón's minister for a few months, until he was replaced by Domingo de Oro, who persuaded the governor to organize a revolution in the neighboring province of Mendoza and engage in a war against La Rioja, which caused his fall.

He supported the invasions of General Mariano Acha and Gregorio Aráoz de Lamadrid in 1841, but on the return of Benavídez he remained deputy leader.

In his last days Rawson introduced copies of the Sarmiento's book "Facundo", which was considered an effective pamphlet against the political system ruled by Juan Manuel de Rosas.

To avoid their being discovered, he hid them in drawers into which he introduced a chemical stench, with a large sign warning that were remedies for venereal diseases.