Yet many GOP-controlled state Legislatures have managed to shore up previously marginal Republican-held seats, which will be a boon to some of the party's incumbents, especially some vulnerable freshmen. Three big redistricting question marks are Florida, Pennsylvania and New York, states that have yet to complete drawing new maps. How those turn out will have a significant effect on the potential for Democratic takeover.
Still, the current political climate has left Walden feeling good.
"We're very optimistic and actually think there are opportunities to pick up seats," he said.
Former Sen. Scott Brown, R-Mass., candidate for U.S. Senate in New Hampshire, holds his hand over his heart during the singing of the national anthem as he waits to take the stage for his town hall campaign rally with Sen. John McCain at the Pinkerton Academy in Derry, N.H., on Monday, Aug. 18, 2014.