Sorry for a stupid, sort of related question. From what I understand the presidential election is in 2 parts the popular vote and the electoral vote. The popular vote chooses the 538 electors and they in turn vote for the president and vice president. The electors are split into either the Senate (100 - 2 per state) or the House of Representatives (438 varies by state). In the popular vote, do you know whether the candidate(s) you vote for are standing for the Senate or the House of Representatives or not? How is that decision made? Whether en elector will sit in the Senate or House of Representatives.
To elaborate on bfv's point: There are 538 electoral votes. They are proportioned to the states according to their number of senators (2 per state) and representatives (varies by population; adjusted after every 10-year census). Each electoral vote is decided by the winner of the popular vote in the elector's district. In most states, it is winner take all; if a state has five electoral votes and the republicans only win one district, all five electoral votes go to the democrats. I believe New Hampshire and one other state allot their electoral votes proportionally. This is how George W Bush lost the popular vote by 2 million votes but won the electoral college; he won the recount in Florida by 238 votes, thereby swinging all 29 of Florida's votes to Bush.
The house and senate are elected directly, the ballot contains a list of candidates for each office and you pick the one you prefer. The candidate who wins the vote gets the office. The electoral college is only for the president. The ballot also contains the names of the candidates for president, but what you're really voting on is whose party gets to pick the electors that will pick the president.