Sen. Al FrankenAlan (Al) Stuart FrankenDemocrats turn on Al Franken Schumer called, met with Franken and told him to resign Overnight Finance: Trump says shutdown 'could happen' | Ryan, conservatives inch closer to spending deal | Senate approves motion to go to tax conference | Ryan promises 'entitlement reform' in 2018 MORE (D-Minn.) on Friday asked Democrats to provide more donations to his colleagues, warning that several of his fellow Democratic senators could end up reprising the months-long recount that kept him from taking his Senate seat.

Franken wrote in a fundraising e-mail for the Democratic Senatorial Campaign Committee (DSCC) that some of his colleagues — like Sens. Barbara BoxerBarbara Levy BoxerBarbara Boxer recounts harassment on Capitol Hill: ‘The entire audience started laughing’ 100 years of the Blue Slip courtesy Four more lawmakers say they’ve been sexually harassed by colleagues in Congress MORE (Calif.), Russ Feingold (Wis.) or Patty MurrayPatricia (Patty) Lynn MurrayDemocrats turn on Al Franken VA slashes program that helps homeless veterans obtain housing: report The Hill's 12:30 Report MORE (Wash.) — could end up in races that are determined by just a few votes.

"Barbara Boxer, Russ Feingold, Patty Murray: Any of these great Democrats could end up in a race as close as mine," Franken wrote. "Any of these 15 races could swing the Senate majority. And that means even a small contribution could make a very big difference."

Franken won the 2008 Minnesota race against incumbent Sen. Norm Coleman (R) by only 312 votes. The final tally was approved only after an extensive, drawn-out recount that was litigated in court for months. It took Franken until July 9, 2009, to be sworn in.

The senator's e-mail for the DSCC underscores just how close some of the Senate races facing Democrats might be. While Boxer and Murray have slight leads in the polls, their races could come down to the wire. Feingold is perceived as trailing slightly in his race, though his incumbent status could also make his contest against Republican Ron JohnsonRonald (Ron) Harold JohnsonOvernight Cybersecurity: Panel pushes agencies on dropping Kaspersky software | NC county won't pay ransom to hackers | Lawmakers sound alarm over ISIS 'cyber caliphate' GOP chairman warns of ISIS's ‘cyber caliphate’ Overnight Finance: House approves motion to go to tax conference — with drama | GOP leaders to consider Dec. 30 spending bill | Justices skeptical of ban on sports betting | Mulvaney won't fire official who sued him MORE a nail-biter.

"We can win this thing. We can stop the Tea Party," Franken said. "But to do it, we have to fight for every single one of these 15 razor-tight races. And that means we need you to step up to the plate right now."