A second round of voting between the two leading candidates took place on 22 November, after surprisingly close results forced a runoff.

[4] This idea[5] was heavily resisted by the opposition parties, and the FPV could not reach the required two-thirds majority in Congress.

However, voters were able to cut ballot papers up and place different sections from different parties inside the envelope if they wanted to vote for different candidates or lists for different posts.

In Buenos Aires and Salta electronic voting machines were used to print out a single unified ballot, with voters able to select different candidates and parties on a touch screen.

Initially, the FPV had several pre-candidates to the presidency, but only Daniel Scioli and Florencio Randazzo had a good reception in the opinion polls.

[20] Randazzo did not accept to run for governor of the Buenos Aires province, which had primary elections between minister Aníbal Fernández and Julián Domínguez.

With Kirchner unable to run, three candidates led the opinion polls; Daniel Scioli, Sergio Massa and Mauricio Macri.

[23] Ariel Velázquez, a sympathizer of the Radical Civic Union, was shot in his house in Jujuy, after taking part in the political campaign.

Scioli accused users of social networks to plot to damage his public image, and claimed that he has all of them identified.

The Argentine citizens that actually promised had received “sacks stuffed with bottles of cooking oil, pasta and flour.”[24] Open primary elections for the Presidency were held nationwide on 9 August 2015.

Scioli led the field with 38.41% of the vote, nearly 8 percentage points ahead of Macri; both figures would have placed him close to the threshold for avoiding a ballotage.

Both Macri and Massa easily defeated their rivals in the primary elections; Scioli, Stolbizer and Rodríguez Saá were the single candidates of their respective parties.

Opinion polls previous to the result suggested that Scioli would win by a wide margin, and might even be able to avoid a ballotage.

Both candidates were polarized on the opinion about the presidency of Cristina Kirchner: Scioli proposed to keep most of the Kirchnerite policies, and Macri to change them.

[29] Several politicians and state institutions run by the FPV released messages warning about terrible things that may happen if Macri was elected president.

[31] It is rumored that the campaign may have been suggested by the Brazilian João Santana, who organized a similar one in Brazil during the ballotage of Dilma Rousseff and Aécio Neves.

[33] The distance between both candidates slowly narrowed in the following hours, leading to a smaller victory margin for Macri than most exit polls suggested.

[43] The victory was considered significant given that Fernández was the incumbent Cabinet Chief of the Kirchner administration, and that Vidal was directly replacing Daniel Scioli's post as governor of the province.

The Republican Proposal also retained the city of Buenos Aires, that elected Horacio Rodríguez Larreta as the new mayor.

[43] The socialist Miguel Lifschitz was elected governor of Santa Fe, after a controversial triple tie with the PJ and PRO.

During a week, the provisional results suggested that Gustavo Bordet may be the new governor of Entre Ríos, but Alfredo de Angeli claimed that the uncounted votes may turn the tide and make him the winner instead.

The radical Eduardo Costa got the higher number of votes in Santa Cruz, but Alicia Kirchner was elected governor, thanks to the Ley de Lemas.

Neuquén and Río Negro elected Omar Gutiérrez and Alberto Weretilneck, who ran for local parties.

Juan Luis Manzur was elected governor of Tucumán, but the denounces of electoral fraud became a national scandal.

[43][47][48] The MERVAL index climbed 28% to record highs in the four weeks leading up to the run-off, largely attributed to a potential Cambiemos victory, though this dropped 3% on the day following the election.

[69] JPMorgan lowered Argentina's risk index by 16% on the day following the election, to levels not seen since 2011, while Argentine bonds increased across the board.