My guess is that the euphoria following the Citizens United decision has dissipated, and they have realized that, following the very expensive debacle of 2012, many of the Republican operatives are more about separating wealthy donors from their money than they are about getting Republicans elected:
Two things may be keeping Republican strategists up at night: money and the Democratic ground game. Perhaps the biggest untold story of this election is how so many Republican and conservative donors, at least those whose last name isn't Koch, have kept their checkbooks relatively closed. In many cases, GOP candidates are not enjoying nearly the same financial largesse that existed in 2012, and in some races, they are well behind Democrats. While Republican candidates, national party committees, and super PACs are hardly starving, their Senate and House campaign committees have not been able to keep pace in fundraising with their Democratic counterparts. Their super PACs do not have nearly the funding that they had in 2012 (even allowing for the absence of a presidential race this year). And, in a number of key races, Democratic candidates, party committees, and their allied groups have been on the air significantly more than Republicans. GOP strategists have privately said that if it were not for spending by organizations affiliated with the Koch brothers, they might well be in really bad shape.Republican donors realize that they are having smoke blown up on their ass, and they have yet to determine a way to separate the wheat from the chaff.
Many Republican and conservative donors appear to be somewhat demoralized after 2012. They feel that they were misled about the GOP's chances in both the presidential and senatorial races that year, and/or their money was not well spent. In short, they are giving less if at all, and it has put Republican candidates in a bind in a number of places.
Who knows, maybe Karl Rove will need to find honest work.