Your calls do the most good at tipping moments like this, and ENDA is an easy issue. The bill is good. Phone your Representative and tell him or her to not be a complete douche and vote YES on ENDA.
If you have a Republican Rep, phone and vent your spleen about whatever you want. Trust me, it feels great.
Switchboard: (202) 224-3121
Guide for first-timers here.