[Wayne07]

After him the target will be Roy Moore, senate will do everything they can to not let him keep the seat. Then Trump must step down. Horrible.

This Is the correct analysis. Dems have decided it is worth sacrificing Franken if it puts them in a better position to go after Trump (and Moore). So if Franken actually resigns, it is a major warning sign of attacks on Trump in 2018.

[Sivad]

I concur and I wonder if Trump’s rather late endorsement
of Moore did either one of them any favors.