The best thing Cruz could do to save our Republic AND save himself politically would be to make the equivalent of a Nixon ‘Checkers’ speech, confess each and every one of his wrong doings, admit that his behavior has been abominable, his ego had taken over, but he cannot in good conscience allow Hillary Clinton to effectively become Obama’s third term, and that he will do all he can to support and see Donald Trump elected as President of the United States.
That would earn him a LOT of credit across the board. At this point he’s got nowhere to go but UP, I wouldn’t bet a plugged nickel on his chances of even being re-elected in 2018 unless he can re-invent himself.