Before he was Donald Trump's campaign chairman, Paul Manafort embraced extreme tactics in his lobbying efforts. He enlisted a foreign politician who was secretly on his payroll to deliver a message to President Barack Obama in the Oval Office. And he gleefully fueled allegations that an Obama Cabinet member who had spoken out against his Ukrainian client was an anti-Semite. With his guilty plea Friday, Manafort admitted the lengths to which he went to manipulate the American political system and the media for massive profit, exposing how he thrived in the Washington swamp that Trump railed against during his campaign. By pleading guilty, Manafort agreed that he knew he was required by law to publicly report that a pro-Russia Ukrainian political party was paying him and his stable of lobbyists, which included former leaders of Austria, Poland and Italy. Instead, he operated in the dark, working diligently to keep his lobbying for Ukrainian politician Viktor Yanukovych a secret and pocketing millions routed through offshore bank accounts to hide his work and avoid paying taxes. Trump has downplayed Manafort's wrongdoing. "What he did, some of the charges they threw against him, every consultant, every lobbyist in Washington probably does," the president told Fox News. Paul Miller, who runs the Institute for Lobbying and Ethics ... acknowledged that there is a "widespread problem" of lobbyists failing to register their activities. But Manafort went far beyond that, Miller said.