President Obama implored supporters on Monday for donations to help Democrats in the 15 Senate seats he said were "up for grabs" on Nov. 2.

The president painted a picture of an expansive map of competitive Senate races in a fundraising e-mail for the Democratic Senatorial Campaign Committee (DSCC).

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"I'm counting on the DSCC to win the 15 Senate seats still up for grabs over these last 15 days," Obama wrote, asking for more than $900,000 in donations before Thursday to finance a get-out-the-vote "blitz" over the weekend.

Republicans need to pick up a net gain of 10 Senate seats on Election Day in order to win back a majority in the Senate, and make Sen. Mitch McConnellAddison (Mitch) Mitchell McConnellGun proposal picks up GOP support Children’s health-care bill faces new obstacles Dems see Trump as potential ally on gun reform MORE (R-Ky.) the majority leader.

The nonpartisan Cook Political Report lists 11 races as "toss up" contests, nine of which are currently controlled by Democrats. Republicans are also seen by Cook as being well-positioned to pick up Democratic seats in Indiana, Arkansas and North Dakota.

Obama said in his appeal to Democrats that the 15-seat playing field he described — and it's not clear which races exactly make up that list — will be "going right down to the wire." 

The president will be lending his support for vulnerable Democrats, too, with several days of travel and fundraising this week. Obama will attend a DSCC fundraiser in suburban Washington DC on Monday night, and travel to Washington on Thursday for an event for Sen. Patty MurrayPatricia (Patty) Lynn MurrayChildren’s health-care bill faces new obstacles Overnight Health Care: Schumer calls for tying ObamaCare fix to children's health insurance | Puerto Rico's water woes worsen | Dems plead for nursing home residents' right to sue Schumer calls for attaching ObamaCare fix to children's health insurance MORE (D). He'll attend fundraisers for Sen. Barbara BoxerBarbara BoxerTrump riles Dems with pick for powerful EPA job Pelosi's chief of staff stepping down Time is now to address infrastructure needs MORE (D-Calif.) and Senate Majority Leader Harry ReidHarry ReidChris Murphy’s profile rises with gun tragedies Republicans are headed for a disappointing end to their year in power Obama's HHS secretary could testify in Menendez trial MORE (D-Nev.) in their respective states on Friday.

"The DSCC has already begun to shift momentum in our favor in critical races — but Republicans only need to win 10 of the 15 seats up for grabs to take the majority," Obama wrote Monday. "But if you keep moving forward in the face of difficulty, we will win this election."