Let's get this back on topic...
No, Obama did not overturn the NP rule change - he doesn't have the authority to make such a change.
+1. Except in certain situations, the President cannot summarily overturn federal regulations without going through a public comment and legal review process. He can overturn
pending regulations, but not ones that have already been enacted.
No idea what garryc is referring to.
There has been a rumor circulating that the CCW rule was put on hold by the Obama administration. I've heard it repeated firsthand at a gun store. Obama
did, in fact, issue an executive order putting a "temporary" hold on all executive orders and
pending regulations issued during the last 90 days of the Bush administration so his team can do a "thorough legal review" (whatever that means).
However, the National Park CCW rule
has already taken effect, so Obama
can't summarily overturn it without going through the review process again.
Here it is, from a source that I trust to give us the straight dope:
http://www.nraila.org/Legislation/Federal/Read.aspx?id=4331
The new parks rule does not fall into any of these categories. The rule was published in December 2008, and took effect on January 9, 2009.
I'd say you can go ahead and carry.