I respectfully disagree with you about Gov. Walker.
You may have another candidate that you prefer but Walker has fought hard against the left in Wisconsin (and their allies who flooded the state with activists and money, and the courts who went after him and his conservative allies) - and won, again and again and again.
On the campaign trail, he has been playing it very safe, afraid to take risks, afraid to say anything that will antagonize the media and liberals. Seems like he is sticking his finger in the wind and waits to see if it is safe to take a stand. Other times, he waits to see what Cruz says, and tries to out-conservative him, if it is safe enough.
His hiring of GOPe operators, who specialize in going against conservatives, is not a good sign.