You’re using the wrong metric in looking at dollars spent. An explanation in two articles, if I may be lazy:
1. “ Aipac traditionally endorsed candidates sympathetic to Israel as a signal for others to fund their campaigns. But in December 2021, the group for the first time in its 70-year history moved into direct financial support for individual political campaigns by launching a super political action committee, the United Democracy Project (UDP).”
2. “ AIPAC has a somewhat unique model that a simple dollar comparison might miss. AIPAC-linked activists often begin donating to future members of Congress early in their political careers, thus encouraging other pro-Israel donors to fund and otherwise support candidates with long-term promise. Pro-Israel activists are a political force, but the reasons apparently go beyond sheer spending power or the influence of AIPAC-linked networks.”
https://www.opensecrets.org/orgs/top-donors
Evil AIPAC? #199 of over 9,0000
https://www.opensecrets.org/orgs/american-israel-public-affairs-cmte/summary?id=D000046963