I don't see how this could be - who is more of a cookie cutter "true conservative" than Scott Walker at this point?
He once said nice things about immigration reform.
Believe me, if you trawl the various right wing comment boards or forums like The National Review, RedState, everybodies a sellout mushy moderate if they even once talk practically about what they can accomplish, even if they're throwing red meat out the other 99% of the time. Even Ted Cruz.
Remember, the base of the GOP firmly believes that Obama won another election as a full throated socialist, so only a full throated "true" conservative can win by getting out the vote of all those mythical (white) conservative voters who didn't vote in 2012.
Hell, I've seen people say that instead of trying to get a larger vote among minorities, they should double down on the white vote and try to scare enough white moderates who voted for Obama with things like Ferguson, Baltimore, and the random 'illegal immigrant drives drunk and kills a pretty white girl' stories out there to convince those white moderates that the DNC is in the tank for "minority special interest" groups.