"Hello Forest, can't see you, I'm looking at this tree..."
That's most of the discussion on this thread. The problem, in the end isn't the money spent in political campaign donations. It's not which side get's more from which cause both have their cash cows. Dem's rely more on big single donations and the GOP get's theirs through massed smaller contributions through various groups. The problem is the people voting. Seriously. And no amount of complaining about the "Money in politics" is going to fix that. As long as we keep allowing power to congeal in DC, the worse the situation is going to get. That's why the nation was set up as a Representative Republic, to dilute the influence of wealth and keep the political class as it were, as accountable to the local level as possible.
The only real solution would be to limit campaign spending, not donations. But that again hits the wall of what you restrict outside groups to doing. And that's the rub. If only the campaign's can spend say, 5 million on senate campaign for example... how do you constitutionally justify telling a group of people not part of the campaign they cannot use speech to support the candidate? You cannot and it would immoral to try.
The people, need to be wiser voters, but that's not gonna happen with out current level of bribed stupidity and terribly divided country.