WaPo:

The deal Donald Trump struck with the Republican National Committee this week that allows wealthy supporters to give nearly $500,000 to finance his campaign and get-out-the-vote activities made it official: The parties are back in the big-money business.

Fourteen years after a landmark campaign-finance overhaul clamped down on the flow of unregulated money to party coffers, both Republicans and Democrats are raising huge contributions again with gusto.

Thanks to a pivotal 2014 Supreme Court decision and an expansion of party fundraising slipped into an appropriations bill later that year, the RNC and its Democratic counterpart have been able to vastly increase their top donor levels by pooling numerous accounts and affiliates together into jumbo joint fundraising committees.