Should Democrats register as Republicans so they can vote in the primary?

A friend of mine was telling me she is going to change parties to vote in the primary. She is a Democrat who voted for Gov. Hogan in Maryland. She now lives in Florida, and we have a closed primary here so she is going to change parties. She wants to vote for the Republican she likes best, it is not to try to sabotage the vote, even though in the end she will almost for sure vote for Biden. I have never changed party to this, but it is worth considering.

Imagine if millions of Democrats changed parties to influence the Republican primary. I’ve never done it, I have never changed parties to vote for a Republican in a primary or any other election for that matter.

If you are a Democrat or Independent, who would you vote for? Which Republican is the lease scary to you? Or, even better than that, someone you feel very comfortable with?

I have friends in Florida who voted for Chris Christie when they live in NJ. They still like him.