James Madison was not a Democrat. He was a Democratic-Republican. Neither he nor the other writers of the United States Constitution thought zygotes, embryos and fetuses are either persons or citizens for they cannot be, without abridging the rights of ACTUAL persons and ACTUAL citizens.

https://www.hrone.com/blog/china-maternity-leave-policies/

https://www.ncsl.org/civil-and-criminal-justice/self-defense-and-stand-your-ground

https://en.wikipedia.org/wiki/Anti-abortion_violence#United_States