The Wisconsin senators are republicans, not necessarily conservatives. Voting against rinos without democrats is always easier. It will not be as easy for them to compromise, make deals, or reach across the isle.
Also, voting will take much less time because the democrats will not be there to squeal like pigs while debating bills. This also gives them political cover to vote for whatever they want because it is already a circus.
Also, I am not sure if they will need a majority of just those present or a majority of the total. 10 out of 19 is a lot easier than 17 out of 19 to pass a bill.
Ah, yes, the RINOs. Good point.
Then the Wisconsin Senate should pass every non-fiscal bill that would have failed due to a RINO-Democrat alliance. Show the Democrats that they have cut off their noses to spite their faces.