they need 20 - there are 19 republicans, they need one democrat to make a quorum so they can vote
SECTION 7. Each house shall be the judge of the elections, returns and qualifications of its own members; and a majority of each shall constitute a quorum to do business, but a smaller number may adjourn from day to day, and may compel the attendance of absent members in such manner and under such penalties as each house may provide.There are 19 Rs and 14 Ds. Where do they get that they need twenty state senators (60%) for a quorum?