Democrat Jon Ossoff on Wednesday sought to get a jump on Republican Karen Handel in a closely watched runoff with a nearly $300,000 television ad buy in the Atlanta media market.

Ossoff's initial purchase ahead of the June 20 contest, to run Thursday through April 26, was to run on broadcast and cable, was being supplemented by the Democratic Congressional Campaign Committee, which placed a roughly $450,000 television to run during the same period, media sources said.

Sources said they did not see any similar advertising investments from the Handel campaign or the National Republican Congressional Committee. However, both were expected to begin buying time in coming days.

The race for Georgia's vacant 6th district is expected to draw millions of dollars in advertising and manpower from Democrats and Republicans following Tuesday's competitive "jungle primary" that Ossoff came close to winning outright despite the conservative lean of this traditionally GOP seat.

Tom Price vacated the seat in January to become President Trump's health and human services secretary. Republicans have represented the district since the 1978 election. That year, it was won by Newt Gingrich, who would rise to become House speaker.