[2] The military regime's imminent call for elections led Jaroslavsky in 1972 to join the "Movement for Renewal and Change," Raúl Alfonsín's center-left alternative within the UCR to Ricardo Balbín's more conservative, mainstream ticket.
[1] Jaroslavsky was steadfast advocate of Alfonsín's policies while Majority Leader, and shepherded the ratification of the 1984 Beagle Channel Treaty with neighboring Chile, progressive divorce and spousal rights laws, and the President's controversial, 1986 plan to relocate the nation's capital to the small patagonian city of Viedma, which obtained Lower House passage in 1987 (though it failed to gain Senate approval).
[3] An unprecedented financial crisis led to a loss of both the presidency and congress for the UCR in the 1989 elections, and it befell Jaroslavsky to lead negotiations with representatives of the victor, Carlos Menem, on June 15.
[2] Continuing to promote an understanding with the opposition Peronists, Jaroslavsky in 1992 became the first prominent UCR figure to publicly support President Menem's call to amend the Argentine Constitution in favor of allowing presidential reelection.
Taking part in the Constitutional Convention that August, he was brought on as campaign manager to the relatively inexperienced UCR presidential nominee, Governor Horacio Massaccesi.