"Um...do they oppose abortion?"
Abortion is outlawed in every Latin American country except Cuba.
Doesn't mean that every Mexican is a practicing Catholic and opposes abortion, but basically Latinos are Catholic, and conservative on family values issues.
Most Latinos oppose abortion.
So, yes, more Latinos = more conservative Catholics, more Catholics = more opposition to abortion.
In time, you could end up having an anti-abortion pole start to rise within the Democratic Party too, if illegal immigration/amnesty continues apace. In time.
Sorry to explode your myths about the values of the average illegal immigrant: They have a very high level of alcohol use/abuse. At the age of 16, I was propositioned to supply firearms for smuggling to Mexico by illegal immigrants I worked with. Also at the age of 16 (the first time anyone offered me hard drugs for sale), I was offered cocaine for purchase by an illegal immigrant.