The answer to the OP's question would at first seem to most of us to be obvious. No, a born again Child of God cannot vote Democrat.
But it's not as simple as that. Almost 35 yrs ago, even before I was a Christian, I became politically aware of the fact that in order to be or vote Democrat, one had to be either ignorant and naive, of just plain evil. There literally is no other alternative explanation.
OBVIOUSLY I AM NOT SAYING THAT REPUBLICANS ARE SAINTLY AND PURE AS THE WIND DRIVEN SNOW!
But look at how insanely wicked and evil their agenda is today.
Defund the police,
Abortion up to and INCLUDED for a time AFTER birth,
Forced acceptance of homosexuality and even transgenderism accompanied by punishment against Christians for speaking against and resisting.
Openly advocating Marxism / Socialism, and destruction of Capitalism,
Open borders for any and ALL illegal aliens,
An OUTRIGHT animosity toward God,
There is more, but even just ONE of the above should utterly preclude a professed Christian from voting Democrat.
Now people don't like to be called ignorant, whether it's absolutely true or not. They cling to identity politics. Bringing up the failings of INDIVIDUALS, rather than implemented and attempted implementation of policy.
Or they examine an issue using a mile wide and inch deep approach. Saying things like, " Police abuse their power, especially against minorities" As if events perpetrated by individuals applies to the whole, and solution should be to get rid of them.
Or, "I personally think abortion is murder, but I can't tell other women that murdering their baby should be against the law".
So I think there are vast numbers of people, who may in fact be Christians, yet are too proud to examine their ignorance. It's very hard for ALL of us to admit we were ignorant and wrong on something. But we are now at the point that is no longer acceptable, and everyone is going to stand before the Lord one day and explain why they voted for a crystal clear EVIL agenda.