The two Democrats do take the occasional shot, but Mrs Clinton, in particular, is more focused on her party rival.
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The chief factor in his election as party leader, perhaps, was that he was the most obvious alternative to Mr Papandreou, his old party rival.
The Scottish Socialist Party, rival left-wing party Solidarity, the Scottish Senior Citizens' Unity Party and UKIP are also contesting the by-election.
The breakaway Pro Euro Conservative Party fielded rival candidates against the Tories in the European elections.
This is what they'd hoped for, an atmosphere without tension where the English can party with rival fans.
Arguably, there are more ideological differences within the party than with its rival, the Liberal Democratic Party (LDP), which governed Japan for most of the half-century to 2009.
Only 6% said that they would stop seeing a friend who had joined a rival party.
His aides said the protesters were sent by a rival party, a line reproduced on television and in the next day's newspapers.
SPD, whose support has slid to some 26%, has two big problems: doubts about Mr Beck as its leader and the full emergence of the Left Party as a rival.
The Democrats' county chair, Doris Adams, tells me Xenia is the belly button of Republicanism - and she seems to be determined to give the rival party a poke in the tummy.
Before long he was openly jockeying for the leadership and was the media face of the party for its 2004 European election success - but when Mr Knapman refused to stand aside for him, Mr Kilroy-Silk quit and formed his own short-lived rival party.
It also might seem to set limits to the scope of Mr Harris and his Common Sense Revolution. (After all, in Ottawa his party has fewer seats than a rival right-wing group, the Reform Party.) But in Ontario's election, at least, he and his revolution have been the main issue.
RPR's co-founders, Charles Pasqua, peeled off before the summer's European elections, soon to create a rival Gaullist party.
Despite running a pork-free election campaign (while his rival Congress Party was promising voters free electricity), Naidu won by a landslide.
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In his case, as with many candidates in Pakistan's elections, it is just a change of affiliation: Mr. Khan used to represent his current party's main rival.
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Mahmoud Abbas, president of the Palestinian Authority and a member of Hamas' rival Fatah party, dissolved Gaza's Hamas-led government and declared a state of emergency in 2007.
This is why Livni's rival for party leadership Shaul Mofaz has adopted a peace plan that is even more radical than Livni's plan to give Fatah everything it wants.
Much of the earlier fighting involved the Mehdi Army militia of Shiite cleric Muqtada al-Sadr and security forces dominated by a rival political party, the Islamic Supreme Council of Iraq.
Mr Sheridan then split with the party and formed the rival organisation Solidarity with former SSP MSP Rosemary Byrne, the only person in the SSP parliamentary group who supported him in court.
Nawaz Sharif, another former prime minister and leader of a rival opposition party, demanded Musharraf resign immediately and announced that his party would boycott the upcoming election, leading to speculation that the polls could be delayed or called off altogether.
In the absence of any obvious national issue, or enthusiasm for Mr Singh and his patron, the party's leader, Sonia Gandhi, it trounced its main rival, the Bharatiya Janata Party (BJP), which looked likely to win around 120 seats.
In both of those elections, notes The Almanac of American Politics, he upset a favored Democratic rival for the party's nomination.
Polls before the announcement put his party far ahead of any rival.
After all, the Congress-Front alliance is aimed mainly at avoiding a mid-term poll that they feared would benefit the rival Bharatiya Janata Party (BJP).
But he assured his Israeli television audience that he could solve his problems with Hamas, the rival Palestinian Islamist party that controls the Gaza Strip.
PRD, this means its handful of governors, chief among them Andres Manuel Lopez Obrador, Mexico city's mayor, who is Mr Cardenas's chief rival in the party.
But his main leadership rival in the party - Matteo Renzi, the mayor of Florence - has said Mr Marini's presidency would be a "disservice" to Italy.
With almost all the votes counted, Mr Santos had won 69% of the ballots and was more than 40 points ahead of his rival - Green Party candidate Antanas Mockus.
Unlike the United States where grand bargains are talked about and then forgotten, the Hartz reforms were actually implemented first by Schroeder and then by his successor Angela Merkel of the rival Christian Democrat Party.
He has been replaced as prime minister by a veteran rival from within the party.
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