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O'Bama
In the US, the presidential and vice-presidential candidates for a party are announced at the party's respective convention. Both the Democratic and the Republican ones occured in fall of 2008.
Barack Obama/Joe Biden John McCain/Sarah Palin
go to : http://projects.washingtonpost.com/2008-presidential-candidates
Five parties nominated candidates for the 2008 U.S. Presidential election, the Republican Party, the Democratic Party, the Libertarian Party, the Green Party and the Constitution Party. In addition to their candidates, Ralph Nader ran as an Independent.
each party nominated presidential and vice-presidential candidates
Quite bluntly: NONE! You can be unable to read or write and still be president if you can get elected.
Do the voters elect electors not the presidential candidates
Richard M.Nixon/Spiro Agnew George McGovern/R.Sargent Shriver
social media
national conventions for nominating presidential candidates.