The difference with Franken is that he was a sitting Senator at the time. Contrast that with a high school student.
The point is that a 53-year old Kavangaugh has testified that the incident that Ford cited did not happen; and that the Senate Judiciary Committee could easily subpoena Mark Judge to testify as an alleged witness of this attempted rape, but due to political motivations Kavanaugh, Grassely nor Trump are calling for an FBI investigation of these allegations:
Title: "Brett Kavanaugh"
https://en.wikipedia.org/wiki/Brett_KavanaughExtract: "
Sexual assault allegationOn September 16, 2018, Christine Blasey Ford, a professor at Palo Alto University, alleged Kavanaugh had sexually assaulted her when he was a 17-year old high school student. Specifically, Ford stated that in the early 1980s, when she and Kavanaugh were teenagers, Kavanaugh and a male friend "corralled" her in a bedroom at a house party in Maryland. According to Ford, Kavanaugh pinned her to the bed, groped her, ground against her, and tried to pull off her clothes and covered her mouth with his hand when she tried to scream. Ford said that she was afraid Kavanaugh "might inadvertently kill me" during the attack. According to Ford, Kavanaugh got away when one of his friends from Georgetown Prep School jumped on the bed, knocking them all over. Her attorney, Debra Katz, has stated that Ford considers the assault to have been an attempted rape.
Ford's allegation had previously been made anonymously; she came forward publicly after Republicans criticized the anonymous nature of her allegation against Kavanaugh. Three days earlier, Ford's allegation had come to light in anonymous form, when Senator Dianne Feinstein (D-California) asserted the existence of a complaint by a woman who requested not to be identified, against Kavanaugh, in which she accuses him of trying to force himself on her while physically restraining her when they were both in high school.
Kavanaugh issued a statement through the White House that said, "I categorically and unequivocally deny this allegation. I did not do this back in high school or at any time." Republicans criticized the decision to withhold "a vague, anonymous accusation for months" before releasing it on the "eve of [Kavanaugh's] confirmation" as an attempt to delay the Kavanaugh confirmation hearings.
Ford has provided a therapist's notes of references she made in couples counseling in 2012 describing the psychological effects of the alleged assault. The therapist's notes, parts of which were released on September 16, 2018, confirm that she had stated that she was assaulted by students "from an elitist boys' school", who eventually became "highly respected and high-ranking members of society in Washington", although the notes do not name Kavanaugh. Notes from another session a year later show that Ford had previously described a "rape attempt" while in high school.
The Senate Judiciary Committee released a letter on September 14, 2018, in which 65 women signatories who say that they've known Kavanaugh "for more than 35 years" and during the time they've known him, "he has behaved honorably and treated women with respect." Twenty-four women who attended the Holton-Arms School along with Ford sent a letter to Congress expressing support for her.
In response to the Ford allegation, the Senate Judiciary Committee invited both Kavanaugh and Ford to provide testimony before the Committee on September 24, 2018. Kavanaugh has agreed to testify on September 24. Ford requested that the Federal Bureau of Investigation investigate her allegation first, but Senate Judiciary Committee Chair Chuck Grassley declined that request and gave Ford a deadline of Friday, September 21 to tell the Committee whether she intends to testify. Grassley added that Ford was welcome to appear before the Committee either privately or publicly."