Predictions are hard, especially about the future.

The Democrats dropped $25 mil into the Georgia special election.  The Republicans dropped $30 mil, which is more money than has ever been spent running for a US rep's seat.  Looks like both national parties have plenty of cash, which is a little surprising what with an expensive presidential election just last November.  You would  think they would still be paying off loans taken out for Hillary and the Donald.
   The Republican (a chick I'd never heard of before) won, 53 to 47 percent which is decent, better margin than Trump got in that district.  Way I look at it, anything better than 1% is decent, anything better than 10% is a landslide.  NHPR called the margin of victory "thin" and "close" but they are just democrats with bylines. 
  Naturally, this win, and the win in North Carolina, delighted Republicans and disheartened Democrats.  But I don't think it predicts anything about 2018.  In a year anything can happen.  If Trump gets health care and tax reform thru Congress the Republicans will be in decent shape.  If he fails, Democrats will capture control of one or both houses of Congress. 
   The msm keep saying that the Republicans control both houses of Congress.  But they have a lot of RINO's in both houses, who are OK with tax-and-spend and fear to rock the boat.  And who may not vote the party line.  Republicans also have a lot of super conservative crazies who don't under stand about compromise and that half a loaf is better than no loaf, and who will vote against anything on the slightest pretext.  And there is always a pretext on any bill, no bill ever satisfies every one all the way, there are always things they want and didn't get, or things that they don't like, and are in the bill.  Look at the Chinese fire drill in the House over health care.  Ryan had to withdraw the Republican bill and rewrite it before he could get enough Republicans on board to vote it thru. 
  Republicans have a lot of work to do if they want to retain control of Congress in 2018.