Did you see that they are saying Obama served 173 days? Recently, a man told me in all seriousness that Obama started campaigning for the presidency when he'd been in the US Senate just "120 days".

McCain, in contrast, they say, has served a vast amount of time.

                                           John McCain Barack Obama
Amount of time served in the US Senate    22 YEARS      173 DAYS

What kind of measuring stick are they using? I suppose it has to do with x number of working days but I can't make it come out in any kind of coherence.