[grobdriver]

when he called law student Sandra Fluke a “slut” for testifying before Congress in support of contraceptives.

She did not "testify before Congress".

[LoveUSA]

and he did not “call her a slut” for testifying. He “called her a slut” for spending $3000 a year on contraception.

[MrB]

And she did not speak “in support of contraceptives”,

she spoke of using coercive force of government to force others to PAY FOR her contraceptives.

[BwanaNdege]

when he called law student Sandra Fluke a “slut” for testifying before Congress in support of contraceptives.

IRRC, Rush called her a "Slut" for saying she needed thousands of dollars each year for contraceptives.

"slut (sl t). n. 1. a. A person, especially a woman, considered sexually promiscuous."

According to this dictionary definition, Fluck has identified herself as a "slut". Rush's main issue is that Fluke wants US to pay for her promiscuity supplies.