The results of the mid-terms, despite gloating from republicans and garment rending from democrats, has more to do with pragmatism than ideology. The senate was doing nothing; whether it was republicans stone-walling Obama's agenda or Harry Reid tabling bills and not allowing votes, no business was being done. Voters wanted this to stop (the old adage, "Do something, even if it's wrong" comes to mind). For good or ill, the only way to get the senate working again was to vote in a republican majority. That is what happened.
So what happens now? 2 possibilities come to mind. First, the republicans make the mistake that they have a mandate to keep doing nothing in terms of legislation. They investigate everything they can think of. Sorry republicans but when most folks are talking politics at the dinner table, it's more along the lines of economics and finances and the struggle just to make ends meet. Benghazi, Fast and Furious are not important to folks who have not seen the recovery the media likes to go on about. If this first option happens, an opportunity will be wasted. Hello Hillary.
The second possibility is that the republicans pass lots of legislation and force Obama to pull out the veto pen. Suddenly we have an unpopular president keeping things from happening. Republicans can then tell the American public, "Look at all the hard work we are doing. We are legislating and passing bills just like you wanted. Too bad we don't have a republican in the White House to sign them." Hello whoever with an "R" after your name.
Time will tell.