The only ones that will hurt would be Heller in Nevada and, maybe, Cruz in Texas. Those are the only two Republicans who are in anything close to tight races.
McConnell can keep the Senate in session. That doesn't mean that the Democrats will show up for every vote or hearing. They'll get their campaigning in anyway.
I find it absolutely appalling that ANYONE in his right mind could vote for O’Rourke. The Dems have scoured their ranks for youngish and pretty ‘Ken Dolls’ to run.......never mind their lack of intelligence. Cruz had better win this one, or Texas will be in play in 2020. (And never discount the level of voter fraud that the Dems are capable of)
What makes you think Cruz will lose in Texas? It will be a blow out. Not going to be close.