As you probably know, the only constitutional residency requirement for the U.S. House is that the Representative must be a resident of the state he represents, but you’re right that if Blackwell lives in the West Side of Cincinnati he wouldn’t be able to vote for himself (and his opponent(s) would make hay of that fact).
The now governor Ted Strickland for living in Columbus, not in his congressional district.
Bob McEwen for his residency problems.
Republican Congressman Paul Gilmor for living in a Columbus burb, not his district.
While we all love Ken, we really don’t want to be hypocrites.
I'm not totally sure where Ken lives.
One last thing:
If Bob McEwen hadn’t lost to Ted Strickland in 1994, then that space cadet (Ted) probably wouldn’t be my governor today