Heading into the State of the Union tomorrow night, President Obama's approval rating is back at 50 percent, an 18-month high, according to a poll from the Washington Post and ABC News. He's also up 19 percent with adults under 30.

What's the reason for this spike in popularity?

It has a lot to do with the president's traditional supporters -- Hispanics, young people, and declared Democrats -- coming back into the fold over the last few months. The president's actions on immigration, internet issues, and his tax and community college proposals probably helped improve his image with these groups. Strong economic numbers, though, are probably the best explanation for the bump in support overall, particularly with white evangelicals, who the poll said approve the president at 10 percent higher rates.

So what does this mean?

Well, it's just one poll. We're not sure whether these numbers will sustain themselves over the long term. That would probably be fairly dependent on the economy as well as whether the public views the president as the good guy in his upcoming battles with the Republican-controlled Congress. So far, when the president and Republicans in Congress have been at odds, the public has penalized both groups with low approval ratings.

But if you're a 2016 Democratic presidential hopeful -- ahem Hillary Clinton -- you're going to be pleased with the potential for a comeback narrative for President Obama.