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).
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.
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.
ECONOMIST: Corruption in Costa Rica: Not so Swiss after all | The
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.
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.
Mr Baidhya said the unity in the party was still possible if Mr Dahal and Mr Bhattarai "rectify their past mistakes".
BBC: Nepal Maoists: Faction breaks away from governing party
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.
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.
CNN: Obama wants 'full vote' for Michigan, Florida delegates
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.
Her campaign said in a statement that she plans to express support for Obama and call for party unity at an event Saturday in Washington.
She had earlier appealed for unity, addressing party delegates in Rangoon.
He said on Thursday he was ready to drop the plan and called for unity in his party ranks ahead of a confidence vote on Friday.
BBC: Eurozone crisis: Right to boost IMF funds, Cameron says
If the opinion polls, party unity and budgetary reality all argue against broad-based tax cuts, it is hard to see them topping a convincing Republican agenda.
Ulster Unionist Environment Minister Dermot Nesbitt, a strong supporter of Mr Trimble, said he was hopeful of greater unity in the party when the ruling council meets.
Cabinet ministers such as Alan Johnson and Harriet Harman rallied round Mr Brown on Tuesday and urged unity in the party, saying voters expected them to focus on important issues like turbulence in the financial markets.
So - in common with other party leaders in the past who have tried to maximise party unity and keep in with the papers by promising referendums - he may find that every solution brings a problem.
应用推荐