The republican party is probably going to crumble soon if they don't stop alienating every demographic except rich white males. They are increasingly becoming like neo-confederates, and the fact that they have let in so many religious radicals is going to hurt them in the long run because they have started to dictate the republican agenda. Back when Abraham Lincoln was a republican, the entire party was way different than it is now. It's starting to go in the opposite direction because it has mostly been hijacked by people who only represent and fight for certain types of people, not everyone.
It's not becoming capitalistic, it is capitalistic. Politicians have to raise money for their campaigns, which is provided partly by ordinary people, but mostly by smaller companies and large corporations. However much they raise is what they get to spend on ads, and then they carpet-bomb smaller communities with them. Unfortunately, a lot of people vote for whoever advertises the most without knowing who they actually are or what they stand for. (Especially if it's for jobs like Mayor, City Commissioner, Comptroller, Judge, Sheriff, etc.) And that leads to a good deal of people getting elected who often don't represent the needs of their citizens very well.

Elections are basically bought now, ever since the Supreme Court made their decision in the Citizens United case to allow companies to spend unlimited amounts of money on financing campaigns, and it has led to a plethora of major issues.