Even better. Among other things, Odin is a deity of magic! It’s like, a wizard God.
My WAG is that Captain America is a really great guy, but hasn’t been tested as a candidate for ruling Asgard the same way that Thor has been, more or less since birth. Even Thor lost the right to wield Mjolnir for a bit.
At risk of sounding dismissive of this sort of discussion… YES.
When is the hammer just lying around for someone to pick up? I thought it would come flying back to Thor after being thrown. I remember a scene from an old Team-Up where Spider-Man webs the hammer in flight, thinking he’s going to slow it down, only to get pulled along as the hammer crashes through wall after wall of a building. Then at some point he sees the hammer flying the other direction back at him, he gets flipped around as it passes him, and he gets pulled back through the same series of holes. Eventually Thor catches the hammer and then bemusedly catches Spider-Man with an arm across his middle (basically punching him in the stomach).
ETA: Found it!
I’d think being an overt Christian would disqualify Cap
Movie-Thor isn’t really a god, apparently. Pretty sure he mentions it in a throwaway line in Avengers, and then Sif also mentions it when she appeared on the TV show.
There was also a one shot character named Elfqueen with the power to animate unliving matter who cheated by animating the ground it was on into a giant hand and using it to smack Thor with his own hammer. She didn’t lift the hammer from the earth, the hammer stayed right where it was while the ground moved. Nice bit of rules-lawyering there.
Marvel’s done that trick a few times. The Blob was said to be unmovable so once when colossus was fighting him, he ripped up the ground under him to throw him in the air.
You have gotta love a girl that can make the earth move… a real knock-out. 
I was going to say that doesn’t make sense even in a comics book perspective. But I guess there’s one perspective in which it does, which is that the hammer (or some magical entity) is controlling the hammer’s weight (or inertial reference or whatever), but has a limited intelligence. So it lets itself be lifted by whosoever is worthy, lets itself be hung from flimsy wooden pegs, and acts immovably heavy when lifted by the unworthy. But it’s dumb enough to be faked out on occasion, which means it works by visual cues instead of some Asgardian equivalent of GPS/accelerometer. Which means that the Asgardians are clever enough to build something that can defy Newton’s Laws, but not clever enough to give it the brains of an iPhone.
A couple of thoughts:
Movie-Mjolnir seems to require an extreme act of nobility to acquire or reacquire the right to use it; Thor couldn’t get the hammer back (in the first movie) until he was willing to die for his friends and the other people in the town. Presumably, once you’ve earned the hammer’s regard, it cuts you some slack.
In the trailer, I kind of wonder if it didn’t allow Cap to shift it a bit to knock down a bit of Thor’s ego and smugness - Thor certainly lost a bit of his swagger when he saw that! But while Cap is generally worthy of the hammer, fooling around at a party is not exactly a great test of said worthiness.
I’m also wondering if there wasn’t a bit of foreshadowing, when Cap shifts that hammer a bit. Maybe later in the movie, we’ll see Cap, in the last extreme, standing there with shield on one arm, Mjolnir upraised in his hand. It’s a great mental picture, anyway.
By that logic, an Australian actor could lift it when dressed up as Thor.
I know you’re talking about Chris Hemsworth, but now I’ve got some crazy wish to see Mel Gibson play an older Thor. (And yes, I know Gibson was born in the US).
More than that, it can be too heavy for Iron Man to lift, and light enough to not break the flimsy coffee table it is sitting on, at the same time.
I was thinking Paul Hogan. “That’s not a hammer…”
It’s not immobile by virtue of being heavy; it’s immobile by virtue of being immobile. Notice that it doesn’t tip over, either, despite being in an unbalanced position. If you moved the coffee table out from under it, the hammer would remain in the same spot, suspended in mid-air.
This also explains how it can hang from a wooden coat rack. That’s where Thor put it, so that’s where it stays.
It’s Mjölnir - it does as it pleases.
I have to say, though, seeing Cap move it a tiny bit in the clip was awesome. 
There was a scene concerning Mjolnir in the Avengers movie that was a nice touch, but you had to think about it. When Thor starts fighting Hulk aboard the SHIELD helicarrier, at one point Thor thrusts out his hand, clearly expecting his hammer to fly into his grasp. It takes a few seconds, though, and of course arrives just in time for Thor to wallop Hulk with it. I thought to myself, what took it so long? Where was it?
I don’t know if it was ever actually explained, but I like to think it was not on the carrier at all, but still on the ground back at the point where Thor boarded the carrier, leaving it behind. I mean, who’s gonna steal it, right? My reasoning was that the carrier wouldn’t be able to lift off if it meant having to lift the hammer.
But then I think Thor traveled to the carrier aboard one of the quinjets, and it’s likely that Thor left it there, rather than carry it around and tying up one hand all the time. In the comics, Thor would often tuck the hammer into his belt, but not so far in the MCU.
And so we come back around to the notion that the hammer can’t be moved, but the ground it rests on (or the quinjet, the helicarrier, an ice cream truck) can. Which still leaves me wondering, after Thor fell to Earth, why did he hesitate when he reached for his hammer?
I think he had his doubts about whether he was still worthy.
Didn’t Deadpool lift Mjolnr at one point? So I don’t know if its standards are THAT high.