Almanac of American Politics: Votes received, Expenditures, Cook index, Area (sq. mi.), Poverty (%), median income, est. population, interest group ratings (year, group, rating)
GovTrack: Bills (session, type, number, introduced date, title, sponsor, summary), roll votes (type, question,r equired, result, bill), birthday, IDs, names, gender, party, religion, urls, maps, photos, number of bills introduced/enacted/debated/cosponsored/speeches, words per speech
Census: lots of democgraphic data
Taxpayers for Common Sense: Earmark data from bigkahuna.xls (id, house_request, senate_request, final amt, budget request, prereduction amt, description, city, county, state, bill, bill secton, bill subsection, project heading, district, presidential, undisclosed, intended recipient, notes, sponsors). earmark per capita for districts. # and amt of earmarks requested and received for politicians.
FEC: Contribution back to 1980. Money raised, %spent, %self, %indiv %pac %labor. Committees (name, treasuer, street1, street2, city, state, zip, connected org, candidate id, type); contribution (fec record id, microfilm loc, report_id, rrecipient, name, street, city, state, zip, occupation, employer, committee/candidate, date sent, amt)
LDA filings: Lobbyist contributions (orgname, filings, prefix, firstnme, middlename, lastname, suffix, contactname). filing (id, year, type, date, signed_date, amendment, certified, comments, senate_id, house_id, filer_type, lobbyist, org, pacs, contirbutions (date, type, contirbutor, payee, recipient, amount, politician))
MAPLight: Interest group support (groupname, category ID, longname)
VoteSmart: Phone numbers, photos, name, birthday, education, religion, candidates, politician URL, party, nickname, votesmartid, birthplace, education.
House.gov: Phone numbers, photos.
CRP: IDs, photos, FEC ID mapping.
USPS: zip2dist, zip4 (zip, plus4, district, city, state)
IRS: Income distribution (bracket_low, agi, n/tot/avg/pct for dependents, eitc, filers, prepared, charity, taxburden, income).
VoteView: Partisanship, icpsr id, predictability.
By hand: Caucuses, write your rep, states (USPS code, name, territory status, wikipedia url, fipscode), districts (name, number, state, voting rights, wikipedia link), politician wikipedia links.
Calculated: Handshakes
counts
bills: 37,998
category: 472
census records: 11,972,408
committees: 39,420
contributions: 15,199,307
districts: 491
earmarks: 13,209
handshakes: 164
interest groups: 1685
lobbyist contributions: 10,1980
lobbyist filings: 15,928
lobbyist orgs: 4272
lobbyists: 14,834
politicians: 11724
positions: 852,697
rolls: 6290
states: 60
votes: 2,062,312
zip4s: 67,551,085