The health care law, abortion and budgetary issues have come up in the race between Democrat Manan Trivedi and Republican Ryan Costello.
Incumbent Democrat Ron Barber faces a 2012 rematch with Republican Martha McSally.
The race for Louisiana's sixth congressional district features a cast of colorful characters.
Because of a quirk in Washington's law, two Republicans face off in the general election.
Incumbent Democrat Ann Mclane Kuster is facing a challenge from Republican Marilinda Garcia in New Hampshire's Second Congressional District.
Democrat Staci Appel and Republican David Young are in a close race to fill a soon-to-be vacant seat.
Incumbent Democrat Joe Garcia is facing Republican candidate Carlos Curbelo.
Republican Tom MacArthur and Democrat Aimee Belgard are vying for a seat left open by former NFL player Jon Runyan.
Republican state Senator Glenn Grothman and Democratic county executive Mark Harris are vying for retiring Rep. Tom Petri's seat.
In this week’s installment of District Profiles, we look at the race between Democrat Bobby McKenzie and Republican David Trott.
Republican U.S. Rep. Steven Palazzo and Democrat Matt Moore are facing off in Mississippi's fourth congressional district.
Republican candidate David Brat, who defeated Rep. Eric Cantor in the primary, will face Democrat Jack Trammell in November.
In West Virginia's third congressional district, Republican state senator Evan Jenkins will try to unseat Democratic incumbent Nick Rahall.
KPBS's Claire Trageser offers a primer on the race between freshman incumbent Democrat Scott Peters and Republican Carl Demaio.
Meghan Verlee of Colorado Public Radio discusses the race between Republican Rep. Mike Coffman and Democrat Andrew Romanoff.
Republican Congressman Joe Heck of Nevada will face Democratic challenger Erin Bilbray in November.
Democratic Congressman Pete Gallego of Texas will face Republican Will Hurd this November, in a race expected to be close.
Georgia Public Broadcasting's Adam Ragusea says even if Rep. John Barrow keeps his seat, "he's going to be an endangered species."
In this new series, we're touching down in a different congressional district each week, leading up to the midterm elections.