The primary elections in the main parties are organized by the states, who also register the party affiliation of the voters (this also makes it easier to gerrymander the congressional districts). The party is thus little more than a campaign organization for the main elections. However, elections in the United States often do become de facto national races between the political parties. In what is known as "presidential coattails", candidates in presidential elections usually bring out supporters who then vote for his or her party's candidates for other offices, usually resulting in the presidential winner's party gaining seats in Congress. On the other hand, midterm elections are sometimes regarded as a referendum on the sitting president's and/or incumbent party's performance. Ballot access Ballot access refers to the laws which regulate under what conditions access is granted for a candidate or political party to appear on voters' ballots. Each state has its own ballot access laws to determine who may appear on ballots and who may not. According to Article I, Section 4, of the United States Constitution, the authority to regulate the time, place, and manner of federal elections is up to each State, unless Congress legislates otherwise. Depending on the office and the state, it may be possible for a voter to cast a write-in vote for a candidate whose name does not appear on the ballot, but it is extremely rare for such a candidate to win office. Campaign finance The funding of electoral campaigns has always been a controversial issue in American politics. Infringement of free speech (First Amendment) is an argument against restrictions on campaign contributions, while allegations of corruption arising from unlimited contributions and the need for political equality are arguments for the other side. Private funds are a major source of finance, from individuals and organizations. The first attempt to regulate campaign finance by legislation was in 1867, but major legislation, with the intention to widely enforce, on campaign finance was not introduced until the 1970s. Money contributed to campaigns can be classified into "hard money" and "soft money". Hard money is money contributed directly to a campaign, by an individual or organization. Soft money is money from an individual or organization not contributed to a campaign, but spent in candidate specific advertising or other efforts that benefits that candidate by groups supporting the candidate, but legally not coordinated by the official campaign. The