You're being very kind. Many people in Congress know that their base is overwhelmingly against this, so the corrupt ones (the vast majority, especially any with good committee assignments) vote against it only if they're sure there's absolutely no chance of it failing. Whether or not they're currently in power doesn't matter. There's horsetrading even between parties to make sure donor/intelligence-supported bills will pass, but also to give people whose elections might depend on it the opportunity to vote against them.

The last thing that Republicans want is another America First libertarian troublemaker in Congress, and the last thing that Democrats want is some lecturing lefty. It's about business, not beliefs. Also, it's probably increasingly about blackmail.

When this math somehow fails (which happens every once and a while if somebody surprises them), it throws everything into chaos.