I've actually seen this claim made a lot, both in the media and on blogs. The basis for that claim is that the speaker believes U6 rather than U3 should be the official unemployment rate, and U6 is typically about double U3.
[edit: See joe_the_user's post, which was submitted as I was writing this.]
The Shadow Government Statics site seems to put the current rate at about 23%.
And sgs altogether makes a fairly plausibly argument... unlike parent article...