By this fall, the number of unchallenged incumbents could surpass the record of 95 set in 1950. It happens because it's also a year when the voters are pretty happy, what with the good economy and the stable world situation. Most House incumbents seem pretty safe. It looks like a waste of money to challenge them. In the vast majority of House elections, there's going to be virtually no campaign at all.
Incumbents are as good as reelected.
The action is going to be concentrated in a small number of competitive House races. Those races are going to see a huge amount of spending by candidates, national political parties and interest groups. About 33 House races are highly competitive. That's less than 10 per cent of the country. They're about equally divided between places with open seats and places where an incumbent is running for reelection.