Here's a report from the reputable Guttmacher Institute, showing that public funding contraception reduces unwanted pregnancies.
Of course, the United States is full of morons who think that abstinence education is the only solution to unwanted pregnancies, that we should not subsidize the lifestyle of poor "sluts" who "choose" to have sex, get pregnant and would seek an abortion, if state law allowed it. I also understand that Congress is full of callous, truly evil politicians who view abortion as the immortal wedge issue that can be applied to a stupid electorate every election to obtain the desired results; so these politicians cut public funding for reproductive care, in hopes that the "moral" divide between good Evangelicals and bad everyone else will play their advantage.
What I don't understand is how people of average intellect cannot see through the ploy of those who speak against abortion, and say they would like it to be banned, and also fight against access to contraceptive care. They are obviously not paladins of morality. They are just manipulative liars who care not one iota about women and their children and would say just about anything that people are dumb enough to believe to hold on to and expand their own power.