EDIT: Didn't read the "back down" there Badazws6. Worded it for someone who had never been down.
I have a buddy that has been down there 3 separate times since June (all week or more long stays driving), and he has not had any issues. He is down there right now in fact.
Last year we had no major issues when we went down in November, and then the media started hyping all the drug war news in early Spring or so. I have a hard time believing that it got that significantly worse from November to March that you wouldn't be able to travel down there.
I would say just practice good judgment when crossing the border and you should be good. I would cross the border in the morning to early afternoon, and just plan not to spend any time in that border area. We generally cross over at Pharr or McAllen (Pharr is better because you can avoid Reynosa). Don't cross over in El Paso, not sure if that is where people from Colorado cross or not, but avoid Juarez.
Last two years I have been down there we crossed the border at about 1AM (stupid time to), and both times we got pulled over for bullshit reasons (last year it was because you couldn't see our license plate because we had a dirt bike on the back in the way...while cars are passing us with no licenses plates on whatsoever). Neither ended up being very expensive, but both times we were in border towns and ended up getting the police officer who pulled us over to show us out of town.
For the most part you are in the country once you get past that initial buffer zone from the border.
Adam I will give you what footage I have someday when I get my computer fixed.