Really? Details?
http://www.nd.gov/sos/forms/pdf/2008-running-for-president.pdf
“When and Where to File
Nominations for presidential and vice presidential
candidates and their respective electors must be filed by
an established political party by 4:00 p.m. on the sixtieth
day before the November 4, 2008 General Election.”
(btw. GOOGLE is your friend)... :0)