Runaway non-defense spending.
The islam is a religion of peace thing and consequent resulting paralysis.
The southern border-is-no-biggie thing. Or the other idiocy: The problem is now so big it's too late to fix it.
I haven't been following news about the borders very much, but here are a couple of things that popped up, lately. There was also some news a few months ago that UAVs are being used over the borders, IIRC.
Feds launch border air patrols from northern NY
http://www.newsday.com/news/local/wire/ny-bc-ny--terror-borderpatr1008oct08,0,4193438.story?coll=ny-ap-regional-wire
And President Bush said during the first debate, "We got a thousand extra Border Patrol on the Southern border, more than a thousand on the Northern border. We're modernizing our borders."