“Last week House Democrats outraised House Republicans and this week more strong Democratic candidates are stepping forward all across the country — putting the House Republican majority in jeopardy," Israel said in a statement. "From all walks of life, these Democratic candidates are committed to creating jobs, strengthening the middle class, reigniting the American dream, and returning control of the House of Representatives to the American people.”

Democrats need to pick up 25 seats in the House to take back control from Republicans, who seized the majority in 2010.

The National Republican Congressional Committee, meanwhile, it hoping to strengthen the GOP's hold in the chamber by retaining the freshman members who won seats in 2010 and picking off additional Democrats in competitive districts.

The candidate lineups in many House races are still murky due to the once-per-decade map-redrawing process that in many states is still under way.