Some Democrats see Kate McGinty as a stronger challenger to the Republican incumbent.
Rep. David Jolly (R-Fla.) said he will reject the "politics of division and class warfare."
The business group is backing GOP Sen. Mark Kirk in Illinois.
Carlos López-Cantera is pitching himself as a Washington outsider.
State Sen. Kelli Ward would likely struggle to compete with the five-term senator's campaign.
Martin Matishak 07/13/15 10:04 AM EDT
Arizona state Sen. Kelli Ward will announce her plans at a "major event" on Tuesday.
A DSCC memo first obtained by The Hill says Sen. Richard Burr is untested.
Rep. Todd Young announced his campaign on Sunday.
Timothy Cama 07/10/15 12:06 PM EDT
The NRSC is up in arms over a campaign against vulnerable Sen. Mark Kirk (R-Ill.).
The poll finds Hassan up 45-44 in a hypothetical 2016 Senate matchup.