I believe that some of these accusations will be shown to be politically motivated and not true. Democrats are trying to be self righteous in pushing Senator Franken out, which is very misguided. Innocent until proven guilty and not guilty by accusation! Go to this link at Change.org to sign the petition.
Former Republican Minnesota Governor, Arne Carlson, is also urging Senator Franken not to resign. A December 10, 2017 article and interview from Minnesota Public Radio is here: https://blogs.mprnews.org/capitol-view/2017/12/former-gop-minn-governor-urges-franken-to-stay/
This article titled "Facts, nuance should matter more in Al Franken rush to judgement" by John Ziegler in USA Today on November 30, 2017 also raises questions about Leeann Tweeden's claim of sexual abuse. Article here: https://www.usatoday.com/story/opinion/2017/11/30/al-franken-scandal-slow-down-sexual-assault-accusations-john-ziegler-column/886722001/