The suggestion is that is was done for political reasons, and there might be some truth to that. A second term for President Obama rests in the hands of independents, especially those in key swing states, and to be seen erring on the side of caution would no doubt grease the wheels with some more conservative independents. But surely, there are not really enough of them to cater to in this regard, and as sex, sexuality, and teen pregnancy are polarizing issues, the dividing line is pretty firm. There is really no hay to be made through making this decision for political reasons.
Perhaps, the truth lies, as always, somewhere in between what we see and what we know