There is going to be no avoiding the abortion issue in this election but I believe I have a way for the McCain/Palin campaign to strike a middle ground note which will appeal to most of the electorate and be sound and fair.
State that your policy is not to outlaw or restrict abortion, but to return the decision to the voters in the states and nationally. Say that the Roe vs. Wade decision was legally wrong, not because you oppose with abortion per se but because the decision was undemocratic and assumed powers to the court to interpret on matters that are left to the states and the federal government in the Constitution.
So that way, if the public opinion is in favour of tightening abortion law, then so be it. The pro-abortion campaigners will have to make their case for their version of the law. If public opinion is in favour of the broad status quo, then anti-abortion campaigns will have to make their case moral, legal and ethical for why it should be tightened.
That, my dears, is called democracy.