7 must-watch Senate races this November

Democrats face a tough fight in the Nov. 5 election preserving their narrow 51-49 majority in the U.S. Senate, as they are defending several incumbents in Republican-leaning states.

Democrats face a tough fight in the Nov. 5 election preserving their narrow 51-49 majority in the U.S. Senate, as they are defending several incumbents in Republican-leaning states.