The Indiana Senate voted 28-22 in favor of House Bill 1001, which would make it illegal to require employees to pay union dues as a condition of employment.

Having already passed the House by a vote of 54-44, the bill now awaits Gov. Mitch Daniels’ signature.

Supporters of the bill have claimed that states with “right-to-work” laws are more likely to attract new businesses than those without such laws. Opponents of the bill claim right to work laws undermine unions and weaken their bargaining power. In a company where a union labor agreement exists, unions must represent worker interests regardless of whether those workers pay union dues.

With Daniel’s signature, Indiana will become the 23rd state with a right to work law.