These five names:

When it comes to defending Democrats' Senate majority, there are five names you should know.

When it comes to defending the Democrats' Senate majority, there are five names you should know, Jason: Sherrod Brown. Jon Tester. Jacky Rosen. Tammy Baldwin. Bob Casey. These are the names of incumbent Democratic Senators whose races are rated "Toss-up" or "Lean Democrat" by Cook Political Report. Just yesterday, Sen. Jacky Rosen's race in Nevada moved into the "Toss-up" category, meaning Democrats' path to defending these five seats became even more challenging. These Senate seats are all at risk, Jason, and losing any of them would pose a grave threat to our Democratic majority. That's why we're asking: Will you pitch in to our Democratic Momentum Fund to support Democratic candidates nationwide right now? Every dollar we raise into this fund ensures we have the resources to support Democrats up and down the ballot in November. DONATE: $7 DONATE: $10 DONATE: $25 DONATE: $50 DONATE: $100 Donate another amount Thanks for all you're doing, The Democrats                                          VOLUNTEER DONATE SHOP Text JOIN to 43367 Manage how often you receive DNC emails, by filling out this form. If you no longer wish to receive emails from the DNC, submit this form to unsubscribe. If you're ready to elect Democrats in all 50 states, territories, and D.C., make a contribution today. Contributions or gifts to the Democratic National Committee are not tax deductible. Paid for by the Democratic National Committee, www.Democrats.org, and not authorized by any candidate or candidate's committee.