It’s important not to get carried away, if only because a scenario in which the Russian investigation ensnares the N.R.A., probably the most influential conservative group in the United States, seems a bit too much like Resistance fan fiction, too delicious to be true. Indeed, if it is true, it has devastating implications for the entire Republican Party, since many officeholders enjoy lavish financial support from the N.R.A. Still, an N.R.A. role in Russiagate would explain a few things, including why the N.R.A. has, in recent years, developed such a close relationship with Russia.