Absolutely!
I would MUCH rather support someone who has genuienly moved toward the ethical positions of pro-life, low taxes, etc. than someone who doggedly sticks to harmful liberal positions.
As for the Planned Parenthood thing, it is not 100-percent clear that Ms. Romney did this to promote abortion. Planned Parenthood does do some OK things (very little, but some) such as pregnency education, VD treatment, etc.
I’m still up in the air on Mr. Romney as a candidate. However, I think a person’s changing his or her position from a wrong one (pro-abortion) to a right one (pro-life) is terrific!