The following statements appear to contradict each other
"I also believe that those who don't pay union dues should not get union benefits. They should be willing to accept lower pay and reduced benefits in exchange for no union dues."
"If someone is not part of the bargaining group, not a member of the union, the employer is free to pay that employee at a different rate."
In the attached link
In every state, workers who want to collectively bargain with an employer must get support from a majority of the workers in a unit (sometimes a whole workplace, sometimes a particular group of employees). When the union gets majority support, it has a legal duty to bargain on behalf of all the workers in the unit, including those who object to the union.
This is the so-called rule of exclusive representation, and it applies everywhere in the country.
In right-to-work states, however, objecting workers can refuse to pay the union for its services. Hence, the double bind: Unions are obligated to provide free services for workers who don't want a union.
http://www.latimes.com/opinion/op-ed/la-oe-sachs-unions-supreme-court-20140710-story.html#
Here is another article by a pro labor source regarding exclusive representation
http://inthesetimes.com/features/unions_exclusive_representation_janus.html