Here is the best article I could find on this.
The Greens' surge in popularity comes after the party on Monday named co-chair Annalena Baerbock, 40, as its first candidate for chancellor. The nomination of Ms Baerbock, a centrist who advocates a greener economy and a tougher foreign policy stance on Russia and China, has been widely praised.
Hopefully the Christian Democrat Union won't be on top any more.
The Portuguese Greens are usually "allied" with the Communist Party (as in they run as one party, which funnily enough given the country we're talking about in this thread, is called CDU) in elections, so that's good.