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John Bazemore, File, Associated Press
FILE - In this June 15, 2016 file photo, Republican presidential candidate Donald Trump gestures as he speaks during a rally in Atlanta. Trump coasted through much of the Republican primaries largely untouched by his rivals, relying on little more than media coverage of his controversial statements and massive rallies to win contest after contest. That free ride is about to end. Democrats are planning a summer of brutal attacks on the billionaire businessman, reserving more than $26 million in cable and network airtime for largely negative advertising against him over the next six weeks.

NEW ORLEANS — Donald Trump's unconventional campaign is about to feel the heat of political organization.

Hillary Clinton and her Democratic allies have invested at least $27 million in commercials in crucial states such as Ohio, Florida and Nevada over the next six weeks.

That's for a series of broadsides against the presumptive Republican presidential nominee.

Those messages will be echoed by hundreds of Clinton workers in those same states — and amplified by President Barack Obama and other top Democrats.

Trump has made few preparations for contending with that sort of well-oiled political machine.