It's also entertained surprisingly few challengers over the years. (digitaltrends.com)
That leaves few challengers for the Jawbone Up24, although I did take a look at the Withings Aura at CES 2014. (techradar.com)
Businessman Richard Hanna (R), who narrowly lost to the incumbent in 2008, is already on TV and is one of few challengers to equal an incumbent in campaign funds. (voices.washingtonpost.com)