prevail, but cnn political analyst ron brownstein says that may not be true anymore. >> what you are seeing is for a significant share of the republican coalition, the fear of demographic eclipse is eroding the baseline commitment to democracy. we don't fully have a language or understanding what that means in american politics. it's what we see in parties in countries like poland, turkey, that win an election and use tools that make it difficult for the other side to ever win again. this is as i wrote in "the atlantic" debate among groups concerned about this, about whether president biden himself and senate democratic leaders are showing enough urgency about what's happening. mexico is suffering a wave of political killings in the run-up to their midterm elections next week. more than 80 candidates have been killed in recent months. hundreds of others have been targeted. matt rivers has more on the