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.
Toomey outraised his likely Democratic opponent by $1.8 million in the first quarter.
He's the latest Republican to pass on the open Senate race.
Senate Democrats need to pick up five seats to regain a majority.
The NRSC brought in $10.9 million for the first quarter of 2015.
The Democrat announced he will stay in the Senate.