I kept getting calls from them so I finally picked up.
I have a credit card that I have the Democratic National Committee charge a small amount to each month. Well, it got rejected the last two months and I just discovered that I was not being charged this morning and got this call this afternoon (well, they've been calling for a few weeks now).
Anyhow, they knew when the last charge on my card was, address and enough other info I gave her my credit card info (she was getting a bit frustrated with me while I made sure it was legit).
Anyhow, I feel it was a legitimate call but will check my credit card bill daily for awhile just to be sure.