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He’s a republican and he has no shame. There is no legal requirement be honest during an election. And there is no penalty for lying if your party has a “do anything it takes” mentality to win elections. 
Therefore it’s logical that he’d show up and moreover he’s going to cling to that seat as hard as he can. Lastly the GOP will help him keep this seat if he toes the line and does exactly what they say.
I can't believe the unmitigated gall he has to fucking show up in the first place!
Any normal person would resign.