You are so wrong. It does not help to vote in a few republicans who are conservative if they never gain power. Much better to vote in as many conservative republicans as possible, with a few others to win control of the senate. How else does Cruz become a committee chair.
We did a pretty good job of purging the party of bad apples. Not a great job. But we did ok. We need to gain power. And then gain control of the republican party. While conservatives may not be in the majority of either house. We are in the majority of the republicans. And if they are in control then we can change things.