in (someone's) wheelhouse
In, related to, or matching someone's general interests, abilities, or area of familiarity; in someone's comfort zone. It's clear, however, that the political implications of this issue are well in the author's wheelhouse. Jeff's always stayed in his wheelhouse when it comes to dating women. He doesn't usually go for anyone very different from himself.
in (one's) wheelhouse
1. In the area of one's greatest striking power: a fastball that was right in the batter's wheelhouse.
2. In line with one's interests or abilities: a movie script that is right in that actor's wheelhouse.