How many republicans in the house and senate switch parties?

I expect at least 4-5 senators to switch including Mitt Romney, Lindsey Graham & Richard Shelby. I won't be surprised if Cornyn & Rubio flip as well.

I further expect 30 or so Reps to flip to Dems.

It's just a gut feeling and fight for survival. They don't care what letter is after their name, just as long as the cooks keep cookin'.