Did a majority of Republican senators not elect Mitch McConnell to be their leader?
Amnesty is not the only issue. And it's a rare senator or congressman who will go against the established seniority and leadership at the risk of losing committee assignments and other desired positions in the senate.
And McConnell and Boner both lied, before their reelection, about how they would take a real stand against Obama's illegal amnesty in the new Congress and when funding DHS for the rest of the year.