Seems like a pretty narrow set of criteria that you set in order for a Democratic resignation to actually be any indication of there being an alternate set of standards for the two Parties. IF they don't have a significant lead over Republicans in the number of seats they hold in their Congressional chamber, IF their length of time left in office is long enough, IF their seat either isn't a 'safe' one or alternately one that isn't guaranteed to go back to Republicans. Any other criteria you'd like to add before a Democratic resignation can mean anything with regards to this debate, or would you rather just wait and see if there are any other noteworthy cases so you can make up whatever bullshit standards that it doesn't meet for you on the spot?