The real estate developer was always expected to build up his fundraising capacity at some point in the campaign, but even veteran campaign financiers have expressed surprise at his strength online, a phenomenon that’s reminiscent — if hardly equal — to the Bernie Sanders cash machine that bedeviled the Clinton camp during the primary.
http://www.politico.com/story/2016/08/trump-fundraising-sets-off-clinton-camp-alarms-226779