This is misleading. The majority of the site's features work correctly in any browser I tried. The page highlighted refers to a feature used to fill out the PDF application in your browser. If the application doesn't support your browser, you can download the PDF instead.
This appears to be a stopgap until online enrollment is implemented. The copy is badly written and should be fixed.
As much as I find this disturbing, I'd rather see a site that works in one web browser than one that doesn't work at all.
A government site that works only in IE is pretty par for the course; perhaps it isn't the golden poster child of "Change" that Obama is looking for, but if the site works in IE, as it claims, that's a start.
Granted, the poor people of Oregon will probably be stuck with this site for the next decade or two, whether Microsoft decides to maintain backwards compatibility with older IE engines or not.
This appears to be a stopgap until online enrollment is implemented. The copy is badly written and should be fixed.