Prime Ministers of Canada:
1993-2005: Jean Chretien (Liberal)
-93: Lucien Bouchard (Bloc Quebecois), Preston Manning (Reform), Audrey McLaughlin (New Democratic), Kim Campbell (Progressive Conservative)
-97: Preston Manning (Reform), Gilles Duceppe (Bloc Quebecois), Alexa McDonough (New Democratic), Jean Charest (Progressive Conservative)
-02: Stockwell Day (Alliance), Gilles Duceppe (Bloc Quebecois), Alexa McDonough (New Democratic), Joe Clark (Progressive Conservative)
-02: Joe Volpe [de-facto] (“Martinite Liberal”), Joe Clark (Progressive Conservative), Stockwell Day (Alliance), Gilles Duceppe (Bloc Quebecois), Alexa McDonough (New Democratic)
2005-2010: Allan Rock (Liberal)
-06: Jim Karygiannis (Renewal), Jack Layton (New Democratic), Joe Clark (Progressive Conservative), Brian Pallister (Alliance), Francine Lalonde (Bloc Quebecois)
-10 (minority): Jim Karygiannis (Renewal), Brian Pallister (Alliance), Jack Layton (New Democratic), David Orchard (Progressive Conservative), Francine Lalonde (Bloc Quebecois), Elizabeth May (Green)
2010-2012: Jim Karygiannis (Renewal-Alliance coalition)
2012-2015: David Dodge (Renewal-Alliance coalition, then Renewal)
-14: Martin Cauchon (Liberal), Paul Dewar (New Democratic), David Orchard (Progressive Conservative), Brian Pallister (Alliance), Elizabeth May (Green), Pierre Paquette (Bloc Quebecois)
2015-2018: Jean Charest (Renewal)
2018-present: Joyce Murray (Liberal)
-18: Jean Charest (Renewal), Kevin O’Leary (Alliance), Paul Dewar (New Democratic), Elizabeth May (Green), Katherine O’Neill (Progressive Conservative), Catherine Fournier (Bloc Quebecois), David Orchard (National)
The POD here (aside, I suppose, from Stockwell Day staying on as Alliance leader) is that the feud between Chretien and Martin escalates to the point where Chretien calls a snap election in 2002 to reaffirm his leadership – as he had threatened to do IOTL. Outraged by his move, Martin supporters publicly campaign against Chretien, strongly criticizing his decision to run for a fourth term, and, with the harshest critics barred from running as Liberals, run on their own various labels, with Martinite MP Joe Volpe acting as their de-facto leader. Martin himself however, retires; still aiming to succeed Chretien as Liberal leader (whenever that might be), he refuses to weigh in on the split and keeps out of the spotlight through most of the election.
With Chretien and his government highly popular, and the opposition parties dealing with their own issues, he’s re-elected with a large majority. In a surprise, the Martinites, combined, narrowly manage to form the official opposition thanks largely to the local strength of their candidates and, again, the ineptitude of their competition. Chretien retires in 2005 after twelve years as Prime Minister, eager to get back to private life and increasingly dogged by scandal. Martin runs to replace him, but by this point his reputation in the party is pretty tarnished. With the Martinites (by this point caucusing under the “Renewal” label) proving to be an irritating opposition, their direct association with Martin causes many Liberals to view him with disdain. As a result, the party selects Chretien-loyalist Allan Rock as his successor.
Rock wins a majority of his own in 2006, with Renewal, eager for revenge after Martin’s defeat, again forming the opposition (in another surprise) thanks to the populist campaign by leader Jim Karygiannis. While the rest of the opposition is in better shape, the split on the right between Brian Pallister’s Alliance and Joe Clark’s PCs (Clark having opted to stay on as leader following the party’s decent-enough performance in the previous election) allows the NDP to pass the PCs and Alliance and place third under their charismatic new leader Jack Layton.
Following the party’s poor performance, Clark resigns as PC leader, and is replaced (to the horror of the party establishment and most of its caucus) by David Orchard. Orchard’s leadership quickly proves controversial, prompting a series of floor-crossings to both the Alliance and, more frequently, Renewal, though repeated attempts to force him to resign as leader fail. With Karygiannis narrowing the party’s policies to the center-right (as opposed to its previous big tent views), Renewal rises in the polls by attracting most of the Progressive Conservative’s traditional supporters, and thanks to Karygiannis’ populist leadership striking a chord with Canadians frustrated by the economic downturn.
By 2010, the economy has it a low point, and Canadians have grown tired after 17 years of Liberal governance, though thanks to the split opposition the party still manages to win a plurality of seats, albeit a minority. Though the Alliance comes in second in the popular vote, Renewal narrowly wins more seats and, with the results clearly showing that Canadians want the Liberals out of office, the two parties form a coalition government under Karygiannis’ leadership. This quickly proves to be a disaster; while Karygiannis was by all means a good campaigner and good opposition leader, he struggles in government and is unable to effectively manage his suddenly much-larger caucus. With tensions rising between Renewal and the Alliance and the government with an abysmal approval rating, Karygiannis leaves office in the summer of 2012, opting to resign before being forced out by his caucus.
With the economy in tatters, Renewal turns to former Governor of the Bank of Canada David Dodge to turn the ship around and, in a somewhat rapid fashion, he succeeds. In 2014, with a successful economic recovery having occurred under his watch, Dodge manages to win an outright majority government for Renewal at the expense of the Alliance, who drop to fifth-place as a result. However, early in his term it quickly becomes apparent that while Dodge was a great leader in an economic crisis, he’s not a great leader elsewhere. His government’s handling of the natural resources file comes under strong criticism from both the left and the right, and his decision to join the American-led intervention in Syria proves incredibly controversial and nearly provokes a split in his caucus. With his approval rating having dropped significantly, Dodge resigns in 2015, being succeeded by former Quebec Premier and current Minister of Foreign Affairs Jean Charest.
While Charest proves far more popular (and far less controversial) than Dodge, he’s unable to significantly improve the party’s polling numbers, and routinely finds himself struggling to fight back against the opposition, both from the left (predominantly the Liberals, under their new leader Joyce Murray) and the right (most notably the Alliance under Kevin O’Leary, who emerge as strong critics of the government’s economic policy). By 2018, the Liberals have been leading the polls for years, and the only question is how big they will win, and while a strong campaign from Charest gives Renewal a significant boost in the polls (largely in his home province of Quebec, where the barely bilingual Murray finds herself struggling to gain traction), it's not enough to prevent the Liberals from winning a majority government.