No. In my political judgement of 55 years since arriving in this country as a post-graduate student, Walker is more electable than Paul, Cruz & Rubio. And I am done with the Bushes. So I am supporting Walker. If polls change and my perception of the landscape changes, I will adapt my support.
In our system of government, winning elections is paramount. No matter how good conservative one is, after losing election there is zero power to change any laws. Ask any one of the past losers what laws they have proposed in congress or from white house and got them passed. The answer is ZERO.
Walker is not pure in some areas. But he is a good conservative based on his record as governor in Wisconsin. It is never easy for a republican to win in Wisconsin. Obama carried the state twice. Walker has proven his ability to win in a bluish swing state. Wisconsin is not Texas or Mississippi or Alabama. And governors have won more in past often than senators.