Eight of 10 hotly contested races are for seats held by Republicans.
Rep. Ron DeSantis's (R-Fla.) bill would not apply to current lawmakers.
Sen. Kelly Ayotte (R) leads Gov. Maggie Hassan (D) by 5 percentage points.
Jonathan Easley 05/06/15 10:11 AM EDT
The conservative favorite is a 36-year-old Iraq War veteran.
McCain's approval rating is under water.
The DSCC is targeting nine GOP senators for past opposition.
Rebecca Shabad 04/29/15 11:16 AM EDT
Democrats say the incident has thrust Rep. Elijah Cummings into a leadership role.
Spencer Zwick is urging GOP businessman Alex Dunn to challenge Sen. Mike Lee (R-Utah).
Joe Heck, an Iraq veteran, is under pressure from national Republicans to get in the race.