When President Obama spoke to the Democratic National Convention in Colorado seven years ago, he tried to call a truce in one of the nation's long-running social debates.
"We may not agree on abortion. But surely we can agree on reducing the number of unwanted pregnancies in this country," he said to applause.
Not long after that, Colorado launched an experiment aimed at doing just that. The results have been dramatic — but efforts to expand the program using taxpayer money have hit a political roadblock.