Senator Franken, 

In 2014, you ran for Senate as a Minnesota progressive.  In 2016, support the progressive movement by endorsing Bernie Sanders in his bid to become president.  Your endorsement would bolster his candidacy by showing he has support from his colleagues in the Senate.  Further, such a large endorsement (from you) would establish him as the progressive candidate in the race and as a serious candidate to be reckoned with.

Sincerely,

The Undersigned