I’m not sure it implies that JPII’s converted people to Republicanism - actually that’s kind of offensive in some light, reducing the pope to a political tool, but I’m sure that’s not what you meant (no sarcasm, really don’t believe you meant it that way).
What I think it’s more indicative of is that Catholicism has become more mainstream, more accepted as a regular part of our society. This is a potentially good thing. After all, the Church is to be the leaven, and having a strong Catholic presence in both parties can be very health for Democracy - imagine two parties battling it out on who can be the most pro-life, who can be the most concerned for social justice, etc. On the other hand, Catholics in whichever party need to guard against getting too assimilated. If you are a Democratic leaning Catholic, you need to admit that the party has a problem with abortion and work to change it. If you are a Republican leaning Catholic, you need to admit that the party is a far too prone to violence and coercion as a solution and need to work to change it.