It's easy to prove your point to grandma:

"Do you believe that one or more politicians were corrputed by the mafia in the prohibitian 1930's, 1940s, godfather film era of the 1950s, and 1960s… basically prior to the mafia crackdown that happened in the drug era 1970s?

If you believe one or more politicians could be corrupted by the mafia, is it impossible to believe that modern day politicians are corrupted by foreign countries?

How many politicians and their spouses have a net worth of over $100 million?

How many of these politicians have spouses that work in financials or are investors?

How many of their spouses are invested in foreign companies, namely China?