The pro-Clinton super PAC Priorities USA will begin airing ads in two key Senate races and will start airing television and radio ads in the Georgia presidential race, the group said Tuesday.

The moves are new signs that Democrats are feeling increasingly confident about Hillary Clinton's standing in the presidential race and are willing to expend new resources on the effort to retake the Senate and expand the electoral map to states that have been solidly Republican for decades. The ads were first reported by the New York Times.

New ads will support Gov. Maggie Hassan in the New Hampshire Senate race against Republican Sen. Kelly Ayotte and Katie McGinty in the Pennsylvania Senate race against Sen. Patrick J. Toomey.

The super PAC also plans a new seven-figure television ad buy in Georgia in addition to new radio ads targeted at African American voters. The state has not been won by the Democratic presidential nominee since 1992.

The Clinton campaign also this week announced that it plans to expand the electoral map to states such as traditionally Republican Arizona. And it also increased its coordination with state parties in an effort to aid down ballot Democrats.