Republican wins in 2010 and 2014 were legitimate, obviously. But you can't seriously argue they have a bigger mandate when Democrats comfortably won the last two elections that had WAY higher turnout. Higher turnout, bigger mandate, plain and simple. Call me when the "dominant" GOP comfortably wins a high turnout presidential election and we'll talk.
The point. The Presidential elections of 1980 and 1984 were stronger evidence of a Republican party gaining dominance in the political scene.
The telling refutation of the idea that the GOP is on the verge of dominance are
(1) abysmal approvals of Republican-dominated state legislatures and Congress
(2) Barack Obama winning two Presidential elections decisively
(3) positive approval of a lame-duck President
The voters who voted in 2006, 2008, and 2012 but stayed home in 2010 and 2014 may be slow to get the lesson -- but if they ever do, the GOP will need to change its agenda
People may be disappointed with President Obama, but not for what he sought -- they still want it. The GOP has little to offer.