A lot of Republican donors and officials are unhappy with their presidential candidate -- Donald Trump. They have decided to concentrate on trying to save down-ballot Republicans, and try to keep their hold on Congress. But that's not looking great for them either (as the charts above from RealClearPolitics shows).
The American voters are still very angry with the Republican-dominated Congress. Every poll has shown that. The average of the six most recent polls shows that only 13.2% of voters approve of the job Congress is doing, while a whopping 77.8% disapprove.
I think the Democrats are going to regain their control of the U.S. Senate in the coming election. The House will be more difficult because of the effective gerrymandering the Republicans were able to do in 2010 -- but if just a small percentage of Republican voters stay home because they don't like Trump, then the Democrats could take back the House also.