A new Gallup poll released yesterday shows that a record number of Americans believe marijuana should be made legal, while support for keeping it illegal continues to decline steadily. As Californians prepare to vote on Proposition 19 on Tuesday, a record 46% of Americans “think the use of marijuana should be made legal” – up from 44% last year, according to Gallup. An all-time low of 50% believe marijuana should remain illegal.

These numbers are more evidence that Americans are increasingly rejecting the notion that otherwise law-abiding adults should be criminalized for using a substance that is less harmful than alcohol. To put these latest results in perspective, more Americans now support legalizing marijuana than approve of President Obama’s job performance.

According to Gallup’s most recent polling average, 44 percent of Americans currently approve of President Obama’s job performance.

Gallup found that support for making marijuana legal was highest among liberals (72%), 18- to 29-year-olds (61%) and people living in the West (58%). Majority support also exists among Democrats, independents, men, and moderates.

No matter what happens on Election Day next week, these numbers show that nationally, support for ending prohibition continues to trend in the right direction. “If the trend of the past decade continues at a similar pace, majority support could be a reality within the next few years,” according to Gallup.

A Rasmussen poll released earlier this week about Americans’ attitudes toward marijuana didn’t reveal any surprising changes in levels of support for reform—43% favor ending prohibition, just slightly less than the 44% Gallup found last October—but it did contain this one interesting nugget:

However, 65% believe it is at least somewhat likely marijuana will be legalized in the United States in the next 10 years. Just 28% do not expect this to happen.

That’s fascinating. If the majority of Americans come to think that marijuana legalization is inevitable, could that make it a self-fulfilling prophecy? Could many otherwise neutral or indifferent voters be encouraged to support reform because they want to be on the winning side? Would that make opponents mellow in their resistance? Whether or not there’s merit to the idea, reformers can’t become complacent. There’s still a lot that needs to happen before we finally turn the page on the failure of marijuana prohibition—including winning some of these ballot measures in November.

Such victories will only advance the perception that prohibition’s days are nearing an (inevitable) end.

A new Gallup poll released today shows 44% support for making marijuana legal in the U.S., a record high for this particular poll. The poll also shows 53% support in the west.

While we’ve seen higher numbers in the past, and the level of support varies from poll to poll, this recent number shows a trend that’s undeniable: Americans are quickly realizing that taxing and regulating marijuana is preferable to prohibition.

The chart below shows the change in attitudes among various groups. Notice that all of them have increased since 2005.