Eight Democrats have topped $1 million raised in the last three months. Sen. Al FrankenAl FrankenOvernight Energy: Trump moves to repeal Obama water rule GOP senator calls for tight scrutiny on AT&T's proposed Time Warner merger Howard Stern: I have a 'man crush' on Al Franken MORE (Minn.) leads the pack so far with just under $2 million raised, with Sen. Mark PryorMark PryorMedicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm MORE (Ark.) close behind after a $1.9 million quarter. Sen. Kay HaganKay HaganLinking repatriation to job creation Former Sen. Kay Hagan in ICU after being rushed to hospital GOP senator floats retiring over gridlock MORE (N.C.) brought in $1.6 million, Sen. Mark UdallMark UdallDemocratic primary could upend bid for Colorado seat Picking 2018 candidates pits McConnell vs. GOP groups Gorsuch's critics, running out of arguments, falsely scream 'sexist' MORE (Colo.) raised $1.5 million, and Sens. Mary LandrieuMary LandrieuWhite House encourages viewing of anti-CNN James O'Keefe video New O’Keefe video shows CNN producer calling Russia coverage ‘mostly bull----’ GOP’s message on ObamaCare is us versus them MORE (La.) and Jeanne Shaheen Jeanne ShaheenDems push for more action on power grid cybersecurity Senate overwhelmingly passes Russia sanctions deal Russia sanctions deal clears key Senate hurdle MORE (N.H.) brought in $1.2 million apiece. Landrieu has just shy of $3.5 million in the bank for her reelection push.

Early money is key for these candidates, as many are likely to face well-funded challengers and Republican-affiliated outside groups have a big cash advantage. Candidates also get air time at cheaper rates than committees and outside groups, making their money go further. 

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One caveat: Sens. Max BaucusMax BaucusLawmakers: Leave advertising tax break alone GOP: FBI firing won't slow agenda White House tax-reform push is ‘game changer,’ says ex-chairman MORE (D-Mont.) and Mark BegichMark BegichPerez creates advisory team for DNC transition The future of the Arctic 2016’s battle for the Senate: A shifting map MORE (D-Alaska) haven't posted their fundraising totals, and candidates with lower numbers often wait until the last minute to put their numbers out. Baucus already has $3.6 million in the bank, however, money that goes far in the inexpensive state. Begich had just shy of $1 million as of the end of 2012.

Another solid haul comes from Rep. Bruce BraleyBruce BraleyTen years later, House Dems reunite and look forward Trump: Ernst wanted 'more seasoning' before entertaining VP offer Criminal sentencing bill tests McConnell-Grassley relationship MORE (Iowa), Democrats' likely nominee to replace retiring Sen. Tom HarkinTom HarkinDistance education: Tumultuous today and yesterday Grassley challenger no stranger to defying odds Clinton ally stands between Sanders and chairmanship dream MORE (D-Iowa). Braley brought in $1 million as well.

In most of these races there are no announced GOP candidates, giving Democrats a jump-start on fundraising. Rep. Shelley Moore CapitoShelley Moore CapitoOvernight Healthcare: Senate delays ObamaCare vote past recess | Trump says GOP 'very close' to deal | Three more senators come out against bill Three more GOP senators announce opposition to healthcare bill Medicaid group's ad buy urges opposition to cuts MORE (W.Va.), the GOP front-runner to replace retiring Sen. Jay RockefellerJay RockefellerOvernight Tech: Trump nominates Dem to FCC | Facebook pulls suspected baseball gunman's pages | Uber board member resigns after sexist comment Trump nominates former FCC Dem for another term Obama to preserve torture report in presidential papers MORE (D-W.Va.) did have a strong haul for an inexpensive state, bringing in more than $900,000. Rep. Bill Cassidy (R-La.), who recently announced a bid against Landrieu, brought in $500,000 but has a strong $2.4 million warchest.

Pryor, Landrieu, Hagan, Begich and Baucus are likely the most vulnerable incumbents.