That comes from this article in the National Journal. Excerpt:
Missouri Republican Senate nominee Todd Akin only cast votes on Monday evening, and Hawaii Democratic Senate nominee Mazie Hirono only voted on Thursday, our review of this week’s roll call votes shows. …
Hirono skipped votes on Monday, Tuesday and Wednesday. The congresswoman looks relatively well positioned in her contest with GOP nominee Linda Lingle in Democratic-leaning Hawaii — but it’s a long flight between the Mainland and the islands, and Hirono stayed out west until she showed up in Washington yesterday.