Ossoff, a 30-year-old former congressional staffer, fell a few percentage points shy of an outright victory amid an 18-candidate scramble in Georgia's 6th Congressional District.
Ms Handel received a little over 19 per cent of the vote on Tuesday. That's not to mention that there will be a different level of voter turnout for the runoff.
Congratulations to Jon Ossoff's campaign for all of their hard work in tonight's landslide in the race for Georgia's 6 Congressional District.
The 43 percent figure across the district (193,483 of 445,095 registered voters) may not be replicated in the June 20 runoff between Democrat Jon Ossoff and Republican Karen Handel.
A GOP state senator in Georgia recently said the 6th district's lines "were not drawn" to elect a Democrat, and yet, there was Ossoff, forcing Republicans to spend millions of dollars they didn't expect to invest in order to barely keep him below 50%. Newt Gingrich came from this district.
As for whether Trump will campaign with Handel, Spicer said: "We'll see if we're needed".
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"We know that this is an important race, and it's going to stay in the hands of a Republican", Handel told CNN.
"We have an awesome chance here, an extraordinary moment for Georgia", Ossoff told volunteers as they headed out for a round of door-knocking on Monday afternoon.
That is crucial if Democrats are to have a shot at reaching their stated objective: reclaiming control of the House of Representatives in next year's mid-term elections.
In a further bad sign of Trump's unpopularity in the district, the ultra-wealthy Republican who closely aligned himself with the president, Bob Gray, performed below his polling average leading into the election. According to a source at the time, Handel was at the center of that decision, and in her resignation letter days later, she said that "I openly acknowledge my role in the matter". "We have defied the odds, we have shattered expectations", Ossoff, who attended a Reform synagogue as a child, told a cheering crowd of supporters.
The president's approval rating has not topped 50 percent since he took office on January 20, Reuters/Ipsos polling shows.
It's strongly supported Republican presidential candidates, too, giving Mitt Romney a greater than 20-point win in 2012. Can you chip in $3 to help Jon Ossoff beat Karen Handel in the run-off? The nation will likely be focused on the little-known Jewish candidate for weeks as he seeks to make the race a referendum on Trump's rocky start in office.