Socialist Party leader Pedro Nuno Santos, left, and Luis Montenegro, leader of the Social Democratic Party, greet each other before an election TV debate in Lisbon, Portugal, Feb. 19, 2024. The center-left Socialist Party and center-right Social Democratic Party have alternated in power for decades. But they are unsure of how much support they might need from smaller rival parties to form a government after the March 10 vote. (AP Photo/Armando Franca, File)