ALPHARETTA — The garden room at Rivermont Golf and Country Club brims with Republican donors and activists, but Michael Fitzgerald wants to talk about Democrats."Shock therapy," he calls it.The 6th Congressional District chairman for Georgia Republicans, Fitzgerald wants to steel party faithful for a special House election to choose a successor to Tom Price, President Donald Trump's new health secretary. Fitzgerald identifies the threat as Democratic hopeful Jon Ossoff, a 30-year-old former congressional aide trying to turn anti-Trump fervor into an upset that would embolden Democrats nationally and shake Republicans ahead of 2018 midterm elections."It oughta be a sure thing for us," Fitzgerald says, before reminding party faithful that Trump barely edged Democrat Hillary Clinton in the district.Rather than the usual Republican romp, Trump finished 14 percentage points behind the showing by then-Rep. Price and well short of what previous GOP presidential nominees have drawn from an affluent electorate in metro Atlanta's northern suburbs.That, Fitzgerald reasons, gives Ossoff hope — along with a deluge of campaign cash and a stable of volunteers ahead of an April 18 primary. Fitzgerald sneers at the "far left-wing" activism, but concludes: "That's what we're up against, folks."Ossoff, a documentary filmmaker who once worked for Rep. Hank Johnson, D-Atlanta, embraces his role as the nation's first candidate to personify the Trump opposition movement, even as he tries to localize the race as being about more than the president."Something is happening here, and we are building momentum that will get us over the top," Ossoff says.