Both of them have given money, but Bradley Whitford has given a lot of money to a ton of candidates and organizations (especially Planned Parenthood, actually.)
Also, apparently Jon Stewart has only given money to one candidate (at least under that name, I forget what his original last name is). He donated twice to Democrat Anthony Weiner's group "Friends of Weiner" aslkdfjas;df How appropriate.
You can also look up your relatives and people you know, which is surprisingly interesting~
ETA: Also, in the spirit of being a complete and utter dork: オバマ大統領、お誕生日おめでとうございます。