The vote is nothing more than a referendum on Trump. Since Ryan and the GOP don't have the balls to impeach Trump for his latest comments on the press, which in fact and reality violates the First Amendment and his oath of office.
There's no guarantee it will pass, the ignorant and biddable complain wrongly that CA is a liberal state but its voting record defies that meme. On Capital Punishment, on same sex marriage and on the entire conservative geography which resides outside of the LA Basin and the SF Bay Area. Though both of these are diverse politically.