Most conservatives and liberals that I know are unrepentant about their ostensible xenophobia when it comes to calls for border control. The thinking goes that we have a sovereign 'right' to control our borders and the only one that matters is Mexico. A conservative colleague concludes in a recent rather conflicting missive ;
The failure to secure the border in a time of emergency in order to protect the health and welfare of American citizens is a sign that this administration has chosen political correctness over the safety of its own citizens. It's sad to say, but I don't believe a Republican administration would take the necessary steps either. 
I am sure that by mid-May the whole Swine Flu scare will be over and the hype will have died down. The American borders will remain wide open for illegal immigrants and terrorists to enter the country; the pharmaceutical companies will have made billions; the media companies will have made hundreds of millions from pharmaceutical company advertising and the administration will take credit for a job well done. Thank God it wasn't a real emergency!
While the rhetoric may not be as incendiary, my own Libertarian Party released a similar statement last week to the alarm of many members, leaders and hardcore activists. It may not be politically popular to advocate an 'open' border, but certainly consideration over the reality of immigration and subsequent public policy is something not being considered without the attendant fears of 'pandemic' by either 'side' that controls this issue.