This is the 1599th most frequent German word.
politischer
"Politischer" means "political" (adjective, masculine form in German).
Here, 'politischer' (political) modifies 'Diskurs' (discourse) as an adjective, indicating the nature of the discourse.
Der politische Diskurs in unserer Gesellschaft ist wichtig.
The political discourse in our society is important.
'Politischer' modifies 'Entscheidungen' (decisions), describing the decisions as pertaining to politics.
Politische Entscheidungen beeinflussen unser tägliches Leben.
Political decisions influence our daily life.
In this sentence, 'politischer' (political) functions as an adjective modifying 'Führer' (leader), describing their role or sphere.