I won't talk a lot about polling. We have another thread for that. Suffice to say that it favored the Democrats by as much as 5%. Places like NH and IA, where there is a permanent polling infrastructure, were much better.
There are a lot of things this election was not. It was not surprising or unexpected. It was not a debacle. It was not a mandate. It was not an anti-incumbent election
That said, it was a referendum on President Obama and/or the ACA. Unlike 1994, the Republicans promoted no agenda. They just watched the Democrats self destruct. If the Republicans are the Party of "No", then "No" won the election.
The battle lines are already drawn. President Obama said he would take action on immigration in the next few weeks. Sen McConnell said that would be a serious mistake. Early action to close the Mexican border is clearly coming. Bill calling for stricter enforcement of existing law, if nothing stronger. Look for a series of bills on fracking, pipelines, drilling on public lands and other oil and gas issues. The Republicans see this as a triple kill--less money to hostile governments, more high paying jobs here, more tax and royalty revenue.
There will be a bill on repeal of the ACA. I doubt it passes. There may be smaller bills, such as a repeal of the mandate or the medical device tax, which will pass. Those will be buried in spending bills to make them hard to veto. Methods for this were perfected by Tip O'Neill in the 1980s.
In 1994 Bill Clinton was faced with a much harsher Congress. He managed it well. Barak Obama has already chosen a different path.
J