Origins of the claims
During the Democratic Party's 2008 presidential primaries, anonymous e-mails from supporters of Hillary Clinton surfaced that questioned Obama's citizenship in an attempt to revive Clinton's faltering primary election campaign. These and numerous other chain e-mails during the subsequent presidential election circulated false rumors about Obama's origin, religion and birth certificate. [25] [26]
Jim Geraghty of the conservative website National Review Online may have sparked further speculation on June 9, 2008, when he asked that Obama release his birth certificate.[27][28] Geraghty wrote that releasing his birth certificate could debunk several false rumors circulating on the Internet, namely: that his middle name was originally Muhammad rather than Hussein; that his mother had originally named him "Barry" rather than "Barack"; and that Barack Obama, Sr. was not his biological father, as well as the rumor that Barack Obama was not a natural-born citizen.[28][29][30]
In October 2009, anonymous e-mails circulated claiming that the Associated Press (AP) had reported Obama was "Kenyan-Born".[31] The claims were based on an AP story that had appeared five years earlier in a Kenyan publication, The Standard.[31][32] The rumor-checking website Snopes.com found that the headline and lead-in sentence describing Obama as born in Kenya and misspelling his first name had been added by the Kenyan newspaper, and did not appear in the story issued by the AP or in any other contemporary newspaper that picked up the AP story.[31][33]
https://en.wikipedia.org/wiki/Barack_Obama_citizenship_conspiracy_theories#Origins_of_the_claims
McCain was born on a military base. Congress passed a bill stating McCain was a citizen. AFAIK, Congress didn't do the same for Obama. However, the requirement comes from the Constitution, which says the President has to be "natural born citizen." The Constitution empowers Congress to make laws about naturalization and citizenship, but not to interpret the Constiution to decide what constitutes a "natural born" citizen. So, it's a Supreme Court issue, not a Congressional issue.
Moot now as to McCain and Obama, but might come up again re: Cruz.
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