The 2021 Portuguese Social Democratic Party leadership election was held on 27 November.[1] If no candidate achieved more than 50% of the votes in the first round, a second round would be held between the two most voted candidates in the first round on 1 December, however, as only two candidates will be on the ballot, a second round will not be necessary. The original date for the first round was 4 December, but the party decided to advance the date by a week. Nearly 47,000 party members, out of more than 85,000 active members, were registered to vote.[2]
One issue identified during the campaign was the rise of the far-right Chega!. Though neither candidate said they would invite the party into government, Rio signalled he would be open to negotiating with them on a case-by-case basis,[3] while Rangel ruled this out, saying he would only negotiate with CDS – People's Party and Liberal Initiative.[4]