These graphs should be illuminating, they spend almost exclusively against Democrats in Democratic primaries and then spend virtually zero dollars on general election races because their goal isn't to be bipartisan but to maintain a maximalist pro Israel consensus which is increasingly extreme.
(friendly quote post) AIPAC does style itself as "bipartisan" and has since its ascent as a lobby on Capitol Hill in the 1970s, but since 2022 when they began directly spending on elections, they have disproportionately endorsed Republicans while spending almost exclusively on Democrats primaries.