The Catholic position is that we are sealed (marked) in/by the Holy Spirit (Eph 4:30) in a rite (baptism) performed by man at the command of Jesus (Mt 28:19). Our sins are forgiven (Acts 22:16) and we are marked permanently as members of God's household. This permanent mark is the reason nonCatholic converts to Catholicism are not rebaptized as long as their nonCatholic baptism was performed with a trinitarian formula (i.e., in the name of the Father, and of the Son, and of the Holy Spirit as prescribed in Mt 28:19).
The Catholic position is that baptism leaves an indelible mark upon the soul that cannot be removed, even by an unbaptism ceremony such as atheists sometimes have. One can renounce the vows one made at baptism (or that were made on one's behalf in the case of infant baptism) but the baptism itself can't be removed or undone. We are encouraged to renew our baptismal promises frequently and we do that at a minimum every year at Easter.
The Catholic position is that just as circumcision was the sign (or seal, Rom 4:11) of membership in and means of initiation into the covenant of Abraham, so baptism is the seal (indelible mark pressed upon us) and means of initiation into the New Covenant of Jesus (Col 2:11-12).
But let's not do it to born again Christians
Catholics are born again Christians as described in John 3:3 (which can be translated "born again" or "born from above"). This rebirth or birth from above occurs in our baptism when we are born of water and Spirit (John 3:5), just as the Spirit descended on Jesus at his baptism. Acts 2:38 tells us that we receive the gift of the Holy Spirit at baptism. 1 Cor 6:11 and Titus 3:5 show us the close association between the Holy Spirit (in whom we are sealed) and baptism. Therefore Catholics are very much a born-again people despite many assertions to the contrary.
The article also mentions that she was "baptized" as an infant, but that only counts in the Catholic church as baptism.
Every nonCatholic in my family was baptized as an infant. And it "counts" in their denominations as well as in the Catholic Church. Perhaps Palin's present denomination doesn't "count" it, but many nonCatholic churches with which I'm familiar certainly approve of and conduct infant baptisms.
Peace be with you.
Amen the seal of the Holy Spirit.
As a side note, what's with all the comments removed by the moderator? Looks like a war was fought on this thread!