Obama and his minions have repeatedly attacked the House as illegitimate, even though, in the system he wishes to overthrow, the House is supposed to reflect, and in fact does most closely reflect, the will of the people. A GOP Senate, if it happens, will not improve this behavior, it will worsen it. In order to understand this, you have to understand the differences between the American and French revolutions, and you especially have to understand the general will.
Obama believe that he and his comrades embody the general will. As such, elections, with their imperfections, serve only to further the general will (when they win), never to retard it (when they lose).
This argument was further developed by Lenin in 1902 in his What Is to Be Done?, and was plagiarized and popularized by Thomas Frank in 2004 in What's the Matter With Kansas?.
The essence of Marxism-Leninism, which is simply a development of the ideology of the French Revolution, is that simple arithmetical counting of votes cannot confer legitimacy on a government, because as part of class struggle, the workers are beset by false consciousness such that they do not and cannot vote in their own interests. A revolutionary vanguard is required, and has more legitimacy than structures created by elections, because the vanguard knows and works for the interests of the workers, when the workers themselves do not.
Because Obama, Jarrett, and many others that he surrounds himself with are Marxist-Leninists, they won't take a GOP Senate capture as evidence that their ideas are not working - oh, no, they will take it as evidence that the Crisis of Capitalism is culminating and they the revolutionary moment (the time for the vanguard to sweep away the rotten old system) has arrived.
You are correct that the time after a Republican election win is very dangerous. Just how dangerous, we'll have to wait and see.
Proverbs 6: 12-19
12 A worthless person, a wicked man, goes about with crooked speech, 13 winks with his eyes, signals[c] with his feet, points with his finger, 14 with perverted heart devises evil, continually sowing discord; 15 therefore calamity will come upon him suddenly; in a moment he will be broken beyond healing. 16 There are six things that the Lord hates, seven that are an abomination to him: 17 haughty eyes, a lying tongue, and hands that shed innocent blood, 18 a heart that devises wicked plans, feet that make haste to run to evil, 19 a false witness who breathes out lies, and one who sows discord among brothers.