SOREL, Que. - Justin Trudeau isn't ready to declare victory in the Liberal leadership race despite having a considerable head start on the competition.

The Montreal MP said he expects a difficult contest and intends to travel the country over the next few months to build up support.

"People are not just going to vote for flash, they are going to vote for substance," Trudeau told reporters Saturday at a Liberal meeting in Sorel, Que., the first since the race officially began on Wednesday.

"Over the coming months, there are going to be a lot of people challenging each other, challenging each of us as candidates to demonstrate that we have the strength and the conviction to be able to earn the trust of Canadians."

While the contest has only just started, Trudeau has a distinct advantage, having announced his candidacy to much fanfare at the beginning of October. Opinion polls suggest his leadership would give the Liberals a considerable boost.

As of Saturday, he was the only person listed as a candidate on the party’s website.

Three other lesser-known Liberals planning a run also gave their pitch on Saturday: Rene Roy, a farmer from Quebec's Beauce region; George Takach, a Toronto lawyer; and retired Canadian Forces Lt.-Col. Karen McCrimmon.

Some of those candidates may not make it far past the starting gate.

The party has imposed a $75,000 fee for entering the contest. It's to be paid in three instalments, the first due upon registration as a candidate, the last due by mid-January.

McCrimmon, who ran unsuccessfully for the Liberals in Ontario in the last federal election, said she had already raised enough for the first payment and planned to travel the country to generate more interest.

On Saturday she was collecting some of the final signatures to officially submit her candidacy.

"I'm doing this because I hope it will be better for all Canadians to be able to see all the different facets of the Liberal party," she said in an interview.

"If all of us are up there on that stage saying 'look at the talent you have to choose from'... we will gain back the confidence of Canadians."

Others have already declared their leadership ambitions.

They include Toronto lawyer and public policy consultant Deborah Coyne, mother of Trudeau's half sister, Vancouver Crown prosecutor Alex Burton, Ottawa lawyer David Bertschi, Ontario government economist Jonathan Mousley and David Merner, former president of the party's British Columbia wing.

Denis Coderre, a prominent Montreal MP, said the list may get a little shorter in the coming weeks.

"It's clear that Justin is official and there are maybe four or five others who are serious candidates," he said.

"It's not just about getting up to a microphone and declaring yourself a candidate... but I think it's clear that there won't be a coronation (for Trudeau), and that's good."

Two potential challengers for the top job, Montreal MP Marc Garneau, who is widely expected to join the race shortly, and former MP Martha Hall Findlay, who announced her candidacy this week, weren't at the Quebec meeting.

In his speech, Trudeau said Liberals have a lot of work to do to regain the trust of Quebecers — and all Canadians.

Trudeau said he wants to offer a vision for Quebec that's distinct from that of the NDP, which nearly swept the province in the past election.

Quebecers want policies that go "beyond the petty rivalries that have taken up so much of our time in the past," he said.

"They want people to be beyond that and that's very much what I'm excited about delivering."

The leadership vote will be held next April.

Related on HuffPost:

Loading Slideshow...
  • "What's up!?" <em>Credit: CP</em>

  • He looks sexy in that uniform, but <em>what is with that moustache</em>!? <em>Credit: CBC</em>

  • Nice sweater. However, we'd like to call attention to Trudeau's blue shirt. <em>Credit: Althia Raj, The Huffington Post Canada</em>

  • "I like to box!" <em>Credit: CBC</em>

  • One of the weirdest publicity stunts ever to be performed on Parliament Hill. Even Trudeau finds it funny. <em>Credit: CP</em>

  • Seriously!? <em>Credit: CP</em>

  • Blue shirt appearance number two. <em>Credit: CP</em>

  • We're not going to knock a guy on his wedding day. <em>Credit: CP</em>

  • Keeping it classy by performing a striptease. See the full video <a href="http://www.huffingtonpost.ca/2011/11/18/justin-trudeau-striptease_n_1101153.html" target="_hplink">here</a>. <em>Credit: Althia Raj, The Huffington Post Canada</em>

  • Trudeau was not having a good hair day in this picture. <em>Credit: CP</em>

  • *Dreamy!* <em>Credit: CP</em>

  • Pairing fall's two "it" colours (black and white) together. Smart sartorial decision one. <em>Credit: CP</em>

  • Okay... <em>Credit: CP</em>

  • No! Just. No. <em>Credit: Althia Raj, The Huffington Post Canada</em>

  • Blue shirt appearance number three. <em>Credit: CP</em>

  • Seriously. This moustache is killing us to look at. (Also, blue shirt appearance number four.) <em>Credit: CP</em>

  • Cheese. <em>Credit: Media Ball</em>

  • It is <em>not</em> okay for an MP or a Senator to wear this. Ever. <em>Credit: CP</em>

  • The weigh-in. <em>Credit: CP</em>

  • A possible future Prime Minister, folks. <em>Credit: CP</em>

  • Trudeau celebrates! <em>Credit: CP</em>

  • Again with the bad hair day! <em>Credit: CP</em>

  • There are no words. The hair. The moustache. The poorly tied tie. Why, Justin? Why!? <em>Credit: CP</em>

  • Blue shirt appearance number five. You bored yet? <em>Credit: CP</em>

  • Adorbs! <em>Credit: CP</em>

  • Blue shirt appearance number six. We're starting to wonder if this is the only shade he has in his wardrobe. <em>Credit: CP</em>

  • Holy flying fur! <em>Credit: CP</em>

  • Really? And you may run to be Canada's next Prime Minister? <em>Credit: Media Handout</em>

  • This is the Justin Trudeau hair we like. <em>Credit: CP</em>

  • Yay! Blue shirt appearance number seven. (That cowboy hat is appropriate, and a sartorially smart decision for the Stampede. Well done.) <em>Credit: CP</em>

  • Keeping it casual. Though, Justin, we suggest you get someone to tailor your jeans (they're far too big). <em>Credit: CP</em>

  • And, for the grand finale: blue shirt appearance number eight. You're welcome. <em>Credit: CP</em>