Mr Santos also praised his predecessor Alvaro Uribe, for whose Social National Unity Party he ran.
Jim Parker, from the Scottish Senior Citizens' Unity Party, was among the crowds, wearing a smiley faced rosette.
His candidacy is backed by the left leaning National Hope Unity Party (UNE).
PUND, the National Democratic Unity Party, Comandos L and Alpha 66 claim to have trained patriots for sabotage inside Cuba.
The Serbian Unity Party run by Arkan, who, as Mr Raznatovic, was once a member of parliament, has refused to comment.
The Scottish Socialist Party, rival left-wing party Solidarity, the Scottish Senior Citizens' Unity Party and UKIP are also contesting the by-election.
Uri Bank, an aide to MK Benny Elon of the right-wing, religious National Unity Party, says the shift is a sign of modernisation.
Damien Hirst and other figures in the Young British Artists movement spent time in Berlin in the post-unity party atmosphere of the 1990s and still exhibit there.
Russia's parliamentary elections on Sunday are hardly a victory for moderate reformers, even though Prime Minister Vladimir Putin's Unity Party came close to matching the Communists' vote.
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Thaksin's Thai Unity Party is polling well among urban voters.
The balance between the two main parties, the National Liberation Party and the ruling Social Christian Unity Party, has lent the country a political stability that is the envy of its neighbours.
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The Unity Party had virtually no other platform.
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For The Mirror , a Czar is born - and one who has taken a giant step towards his dream of succeeding Boris Yeltsin in the presidential election next June, after the success of his Unity Party.
In July 1998 Thaksin abandoned Thailand's political mainstream and founded his own Thai Rak Thai (Thai Unity) Party.
In a bid for party unity, the Democrats elected a new party secretary Saturday, choosing former left-wing union leader, Guglielmo Epifani in hopes of reinvigorating grass-root support.
Tsvangirai said Friday that his party will withdraw from efforts to form a unity government unless 42 party members who have been kidnapped are either released or brought to court to face formal charges by New Year's Day.
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Party unity has been one of the big themes at the Democrat's convention this week.
Since announcing the suspension of her campaign, Clinton has gone to great lengths to promote party unity.
Other would-be speaker candidates either considered running and decided against it, or withdrew in the name of party unity.
Which leaves him pondering EU membership after all and trying to preserve party unity.
Party unity has been impressive, but it will get tougher along the way.
Mr Baidhya said the unity in the party was still possible if Mr Dahal and Mr Bhattarai "rectify their past mistakes".
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She said it was "ironic" that Mr Crosby's plea for party unity was leaked to the media before Tuesday evening's meeting.
But an appeal for party unity and assurances of his commitment brought an end to a spell in the Labour wilderness.
In cyberspace, a group called PUMA (Party Unity My Ass) says things about Mr Obama that would make most Republicans blush.
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EMU-philes concede that a formal split is a long way off, and in public all chant the mantra of party unity.
Yet the zealots, as Mr Ford calls them, will hardly fade away, muting their voices for the sake of party unity.
In his letter Sunday, Obama said all the delegates should be seated with a full vote for the sake of party unity.
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Kenneth Clarke and the pro-Europeans haunt Mr Hague from the backbenches, able at any moment to destroy any semblance of party unity.
Mr Santorum, who has faced calls to bow out of the race in the name of party unity, defiantly vowed to fight on.
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