The United State Department of Homeland Security is an organization under the executive branch of our government responsible for protecting the country domestically. They don't have a mission statement per-se, but if they had one, it might be along the lines of "keep America's homeland safe and secure." This includes, among other things, border security, and keeping people who don't belong in the country out of the country.
Empirically, and somewhat strangely, the Obama administration seems to have an opposite prerogative. When Arizona passed a law to try to identify and detail illegal invaders in their state ("immigrants" is a less accurate term, since that implies people desirous of immigration), the Obama administration opposed it. When Arizona requested national guard help to secure their border, the Obama administration did nothing more than a token gesture. Moreover, instead of trying to help, they put up signs to keep American people out of the area instead, as if they are actively trying to cede the area to the drug cartels. In all demonstrable aspects in this area, the Obama administration appear to be acting on behalf of the illegal invaders and drug cartels, for reasons we can only speculate about.
The question arises: is this mere monumental incompetence and dereliction of duty, or something more? After all, you can certainly make the argument that perhaps Obama didn't realize how significant the problem is, but he's spoken out about the severity, and the signs indicate a knowledge of the scope and implications of the problem. You can argue that the Arizona law amounts to profiling and discrimination against people who are in the country illegally, violating our laws, but that's kinda the point: DHS exists to make it more difficult for those people to be in the US. Oh, and if that's not enough, the law/examination only applies to people who are already breaking other laws, so it's not like the argument that it's random or targets otherwise normal people holds any water. The best argument I can fathom is that we, the legal residents, shouldn't have to give up our freedoms in massive government expansions and reactions to perceived crises, but common: that argument is laughable in the face of the rest of the Obamanation's actions. I just can't come up with a plausible rationale for this being anything other than a well-considered plan of action to undermine the security of the country.
Which, in turn, begs some followup questions. Could you impeach a president for a willful failure to preserve and protect the country? Is the Obama administration's handling of border security in Arizona gross negligence, horrible incompetence, malicious disregard for the country, or something else? What would be the appropriate course of action for dealing with our Traitor in Chief?
Addendum: In related news, Obama administration continues harassment of sheriff on the front-lines of fighting the tide of illegal invaders in Arizona. On behalf of my government and its apparently traitorous leadership, I'd like to apologize to all the hard-working, honorable men and women risking their lives and livelihood to keep the country safe, in defiance to all enemies, both foreign and domestic, and extend my thanks for their efforts in the face of opposition.