I will say I don't think this is an obama thing, but more of a presidential thing. I am sure you don't fricking care, any reason to hate obama is a good reason for you, but just as an FYI.
When Obama came in, his rallies were at the Cox Pavilion, which is near the strip. Therefore I-15, the Strip, and 215 were all shut down. That is pretty much the main 3 roads in Las Vegas.
At least Romney had the decency to hold his event at Red Rock out in Summerlin, which is away from the city center of Las Vegas.