For future reference:
Firaxis>Civ4>BTS>Assets>XML>CIV4VoteInfo.xml
As much as TMIT has done a lot to promote Civ4, a lot of his information is from experience rather than from the source directly, so he's bound to be wrong a few times here and there
EDIT:
This means your own civilization cannot have any more than 61.99....% of the votes or the vote is void. You must get at least 1 exterior vote to put you over the threshold...
This exterior vote may come from:
-befriended AIs at +8 or more (note: once you've selected the vote option, you can do whatever you want about diplo, even DoW and they'll still vote for you)
-vassals
-colonies
Firaxis>Civ4>BTS>Assets>XML>CIV4VoteInfo.xml
Code:
<VoteInfo>
<Type>VOTE_VICTORY</Type>
<Description>TXT_KEY_VOTE_VICTORY</Description>
<iPopulationThreshold>[B][SIZE="4"][COLOR="Red"]62[/COLOR][/SIZE][/B]</iPopulationThreshold>
<bCityVoting>0</bCityVoting>
<bCivVoting>0</bCivVoting>
<iMinVoters>3</iMinVoters>
<iStateReligionVotePercent>0</iStateReligionVotePercent>
<iTradeRoutes>0</iTradeRoutes>
<bSecretaryGeneral>0</bSecretaryGeneral>
<bVictory>1</bVictory>
<bFreeTrade>0</bFreeTrade>
<bNoNukes>0</bNoNukes>
<bDefensivePact>0</bDefensivePact>
<bOpenBorders>0</bOpenBorders>
<bForcePeace>0</bForcePeace>
<bForceNoTrade>0</bForceNoTrade>
<bForceWar>0</bForceWar>
<bAssignCity>0</bAssignCity>
<ForceCivics/>
<DiploVotes>
<DiploVote>
<DiploVoteType>DIPLOVOTE_UN</DiploVoteType>
<bValid>1</bValid>
</DiploVote>
</DiploVotes>
</VoteInfo>
As much as TMIT has done a lot to promote Civ4, a lot of his information is from experience rather than from the source directly, so he's bound to be wrong a few times here and there

EDIT:
This means your own civilization cannot have any more than 61.99....% of the votes or the vote is void. You must get at least 1 exterior vote to put you over the threshold...
This exterior vote may come from:
-befriended AIs at +8 or more (note: once you've selected the vote option, you can do whatever you want about diplo, even DoW and they'll still vote for you)
-vassals
-colonies