He may feel that he has to adopt that platform to win a designated constituency. But its a positive "flip-flop".Nothing would hold him to it if elected though.
His daughter is having a baby I think, so he may also be more sensitive to the issue.
Here is his platform so far according to wiki:
-Pro-life
-Anti-gun control
-Advocates for the repeal and replacement of Patient Protection and Affordable Care Act (Why not the whole thing?)
-Anti-foreign aid (Including Israel?)
-Supports a fair trade policy and believes generally that the People's Republic of China should be considered more of an
adversarial competitor , subjected to significant import tariffs as a response to China's currency policy in order to help balance the U.S. budget.
-Believes the U.S. should disengage in Iraq and Afghanistan
And they forgot to add "Birther"
Sounds like controlled opposition to the Libertarians.