Arguably one of the most relevant topics to US elections right now is influence by Israel. Israel is partly responsible for starting the war against Iran. Israel uses US funding to do a genocide.
Something you should look into is how many states have anti-BDS laws. BDS is an organization that formed in 2005 to promote "Boycott, Divestment, and Sanctions" against the state of Israel. Since 2013, 38 states have passed laws against BDS. https://en.wikipedia.org/wiki/Anti-BDS_laws#Anti-BDS_laws_in_the_United_States
There is a website called AIPAC tracker. AIPAC is one of the Israeli lobby groups, there are others such as CUFI and DMFI. AIPAC tracker is a website that tracks the amount of funding that Israel lobby groups have contributed to a politician's campaigns. AIPAC tracker also has an endorsement list of candidates that haven't accepted money from Israel lobbies.