Nate Cohn looked at the small amount of generic Congressional polling there is available and concluded, consistent with other indicators, that there is no sign of a wave election this year. The polls he looked at showed an average 1.9 percent advantage for the Democrats over Republicans. Cohn wrote:
These findings bear no resemblance to the one-sided results at this point in 2010, when Republicans held a clear 4.7-point advantage, or in 2006, when Democrats were ahead by 10.1 points. The current slight Democratic edge is fairly similar to what generic ballot surveys showed in the days ahead of the 2012 presidential election.
It’s important to emphasize that these polls are of registered voters, not likely voters. Previous years’ surveys were also of registered voters. The Republicans probably have a slight advantage among the older and whiter electorate that’s likely to participate this November. But that’s a separate matter from national political conditions.
While some have predicted a Republican wave based upon Obama’s unpopularity in the polls, the fact that both Congress and the Republican Party have even worse favorability ratings must count for something. The actual result seems to be a decreased turn out at the polls in primary elections so far this year, possibly indicating that voters are fed up with everybody. There is still quite a while until the election, and an unforeseen event still might tilt things towards either party.
The lack of a Republican wave, assuming things stay as they are, should limit the expected loses by Democrats which we would normally see in the sixth year of a presidency. Unfortunately the Republicans are in a good position to take control of the Senate without a wave as the Democrats are forced to defend several Senate seats in red states which they picked up in 2008.
As it now stands, the Republicans have a very slight edge to take the Senate, but there are a number of reasons that Democratic incumbents might still hold onto enough seats to narrowly maintain control. The Hobby Lobby might get more single women to turn out to vote for the Democrats. Republicans still could find ways to lose elections which are now close, such as with a call for nullification of federal laws by the states by the Republican Senate candidate in Iowa:
Joni Ernst, the Republican nominee for U.S. Senate in Iowa, appears to believe states can nullify federal laws. In a video obtained by The Daily Beast, Ernst said on September 13, 2013 at a form held by the Iowa Faith & Freedom Coalition that Congress should not pass any laws “that the states would consider nullifying.”
“You know we have talked about this at the state legislature before, nullification. But, bottom line is, as U.S. Senator why should we be passing laws that the states are considering nullifying? Bottom line: our legislators at the federal level should not be passing those laws. We’re right…we’ve gone 200-plus years of federal legislators going against the Tenth Amendment’s states’ rights. We are way overstepping bounds as federal legislators. So, bottom line, no we should not be passing laws as federal legislators—as senators or congressman—that the states would even consider nullifying. Bottom line.”