On the map,
strong/light color: certain/weak lead
blue: CDU/CSU lead
red: SPD lead
green: Greens lead (look at central district of Berlin)
purple: Left Party lead

Overhang mandate:
In the German system, each state has a certain number of election districts, but twice as many seats to be distributed among parties. Normally, the latter is done according to votes on party lists. That is, for example, if a party wins 40% of the vote and 2 direct mandates in a state with 10 seats, two more people drawn from the party list will enter parliament. However, when a party wins more direct mandates than its share in the list vote, the Parliament increases accordingly and the difference is called overhang mandate. I.e., if say a party wins 5 direct mandates with 40% of the vote in a state with 10 seats to fill, there is one overhang.

_{*Lunatic*, n.
One whose delusions are out of fashion.}