How much influence do pro-Israel groups have over Congress?

Start by separating the claims. A candidate receiving support from a pro-Israel group is a documented campaign-finance fact if the figures are accurate. It does not, by itself, show that the group caused a vote or that the candidate would otherwise have voted differently.

To assess influence, look for specific legislative actions, the timing and scale of spending, public lobbying activity, and whether lawmakers give reasons for their decisions. Even then, influence is usually one factor among party politics, constituents, strategic arguments, and other interest groups.

Also check what “backing” means. It could refer to direct contributions, independent spending, or support from people and organizations that share a position. Those are not interchangeable, and a count of supported winners can be misleading without the full candidate list, comparison group, amounts, and election cycle.

For the defense bill, read the relevant section and distinguish what it authorizes from what it requires. A proposal to expand cooperation is not automatically a new transfer of a specific amount of money.

There is a real policy question here even without proving a single lobby “controls” Congress. Campaign support and organized advocacy can help keep an issue visible and make some political choices more costly. That is worth examining, but it should be described as possible influence, not as proof that lawmakers act on orders.

I’d be cautious with the most sweeping language. Calling a bill a mechanism for hidden aid, or saying it will finance particular actions, needs evidence from the bill text, budget details, and implementation plans. Strong criticism is more persuasive when it identifies the actual provisions and the likely consequences, while marking what remains uncertain.