Support for legalizing marijuana inched up slightly from 45 percent in September to 47 percent today, according to a CBS News poll, conducted Nov. 16-19. Another 47 percent think it should remain prohibited. A year ago, a slight majority of Americans, 51 percent, opposed legalizing marijuana use.

This shift in public opinion was seen at the ballot box this month, when Colorado and Washington became the first states in the nation to approve of recreational marijuana use among adults over the age of 21. Marijuana use of any kind, however, is still illegal under federal law. It’s unclear at this point how the Obama administration intends to respond. …

Americans are divided by party on this issue as well. While 51 percent of Democrats and 55 percent of independents support legalizing marijuana, 66 percent of Republicans oppose it.