Critics point to Harris’s own personality as the reason for some of the problems.
The Senate Democrats' campaign arm outraised its Republican rivals in October by about $1.5 million, according to figures released by the group Friday.
A roundup of where the candidates stand.
Rep. Alan Grayson (D-Fla.) is running for GOP presidential hopeful Marco Rubio's Senate seat.
The Democratic Senatorial Campaign Committee argues the party can retake the Senate.
Timothy Cama 10/26/15 08:41 AM EDT
Sen. Kelly Ayotte is supporting President Obama’s signature climate change rule.
Jonathan Easley 10/24/15 06:10 AM EDT
The Maryland Democrat is expected to decide soon on whether to run for Senate.
The Senate candidate has been the subject of complaints about hedge funds that used his name.
Portman is in a tight race against Democrat Ted Strickland, former Ohio governor.
Johnson's job approval rating equals his disapproval.