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New "Polish memorial" in Berlin [316]
Kohl seemed to have an abundance of charisma, as did Brandt
You are right with Brandt, in his case it helps that he belonged to the resistance against the Nazi, that eased possible suspiscions against him. Kohl however was rather dull in public appearances. The press made often fun of his borish behaviour, comparing him unfavourably to his predecessor Schmidt, who knew how to present himself as a true intellectual. Kohl was however very charming in personal meetings and managed to woo pretty much every foreign politician he met, which came in handy 1989/90.
The point is, being charismatic is not necessary for becoming chancellor in Germany. Germans do appreciate charisma in foreign leaders, otherwise JFK and Obama would not have been as popular as they are/were.