Battle lines shift in House races as Republicans retreat from front-line districts | The Associated Press

Republicans are retreating from several key U.S. House races, while Democrats are racing to raise funds for candidates who seemed unlikely to win earlier this year. The Congressional Leadership Fund, a leading House Republican super PAC, has canceled spending in four races and increased investment in 16 others. Meanwhile, Democrats are eyeing openings in Republican-held districts and hoping to raise millions for a late advertising push.