An election is not actually held for McConnell's seat. Yes, ballots are cast, but instead of counting them, state officials roll dice to determine his margin of victory - McConnell losing is not an option.
TL;DR: McConnell will never be defeated.
It's funny how she's now qualified for her cabinet position because in the past she was appointed to a position she was unqualified for.
She has a near-unprecedented amount of experience for Transportation. I can't think of a single Secretary of Transportation with as much prior experience in the office as her.
She has never been appointed to a position she was unqualified for, either. Wikipedia:
Chao had experience in a shipping company before becoming a Commissioner of the Federal Maritime Commission and Administrator, then Deputy Secretary of Transportation, then Director of the Peace Corps, then Secretary of Labor, and now Secretary of Transportation.
