I'd be inclined to agree with you except for the fact that Mark Warner also announced this week he's not running for President.
I think it's actually to Hillary's advantage for the RATS not to retake control of Congress. They'll go for impeachment, insist on bringing the troops home, raise our taxes.
If they did take over, she'd be trying to run for the White House with most of the country saying "Dear Lord, what have we done?"
I am in complete agreement. The country would be so sick of the Dems' screaming night and day, why would they want more?