That is a big possibilty if a country decided to legalized bitcoin and become one of their legal tender. Once the bitcoin became a widely currency in that country, their politician will also start using it to fund their party or election campaigns. They can also use the bitcoin to influence people, fund rallies and even the lobbyists in congress. And if the government won't impose a regulation on the crypto exchanges that operating in their area, some will use bitcoin illegally like money laundering. That money laundering can also use to fund some politicians and their party organizations.