Rick Mercer is happy that the Liberal leadership race is finally getting interesting. He just wishes it wasn't for all the wrong reasons.

The CBC comedian took to the airwaves Tuesday night to bemoan the way Grit hopefuls are “starting to feast on one another” — in particular front-runner Justin Trudeau — instead of offering up big ideas. He called out both Marc Garneau and Martha Hall Findlay for their recent swipes at the Quebec MP.

“This is important in politics because if Justin does win, the other parties will need footage of Liberals attacking him if they want to destroy him,” he said during a rant on the ‘Rick Mercer Report.’

Mercer also took a pointed dig at other candidates who may be struggling to attract attention in a race featuring the son of a former prime minister.

“There's the woman with the hair like this and the woman with hair like that, and then the grumpy lady, the tall guy and the not-so-tall guy,” he said. “One other candidate George Takach recently dropped out and endorsed Justin, which is pretty cool because I think he's the gay guy who played Sulu on Star Trek.”

But it’s not just Liberals that have Trudeau in the crossfire.

Senior Conservative cabinet minister Jason Kenney has also entered the fray in recent weeks — something that “normally isn’t done.”

Kenney accused Trudeau of "ethical problems" for accepting public speaking fees while still sitting as an MP. He also suggested the Quebec MP lacks experience, in part because he was a teacher and hadn't “run anything” before entering public life.

“But really Jason Kenney shouldn't pull on that string because the only thing he did before politics was work as a lobbyist,” Mercer said. “And yes, while teachers may not be that popular, lobbyist is worse. That’s like two notches below puppy mill owner.”

Mercer suggests that Liberals should learn from New Democrats, who were able to keep “bad blood behind closed doors” during their leadership race last year.

But his biggest tip is for Trudeau, who recently announced that he was able to sign up 150,000 supporters in advance of the April vote.

“And my advice to Justin, yes school teacher is on your resume but so is punching Patrick Brazeau in the head,” he said. “Lead with that and then do yourself a favour and come up with an idea.”

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  • They Like Him, They Really, Really Like Him

    Justin Trudeau has captured the imagination of Canada's political media. Here are the 11 most ridiculously flattering things they've said about him so far this year.

  • 11. "He's got great hair"

    <a href="http://www.torontosun.com/2012/06/16/justins-the-one-10-winning-reasons-why" target="_hplink">- Warren Kinsella</a>

  • 10. "The man is genuinely, immensely likable"

    "Justin Trudeau does not shake your hand; he inhabits it. The wrist cocks out and up, the fingertips down; the elbow shoots off to his right; the shoulder rises slightly. Then a friendly grin dawns as he delivers a firm but not crushing grip, looking you in the eye, with a twinkle in his own. The effect is of someone who is warm, slightly embarrassed by the fuss, almost goofy, and genuinely happy to meet you. It is likely that some of this is practised; he would have spent his early social years deflecting other peoples' preconceived ideas about class and snobbery. Either way, it is effective. The man is genuinely, immensely likable." <a href="http://o.canada.com/2012/08/17/electrifying-and-elusive-justin-trudeau-quietly-mulls-his-political-destiny/" target="_hplink">- Michael Den Tandt</a>

  • 9. Sisyphus & Icarus?

    "Trudeau is part Sisyphus, driven by his nature and upbringing to push his political rock up the hill. And he is part Icarus, driven to prove himself in spectacular ways, whether by crossing rapids, speaking off the cuff about separatism or exposing himself to defeat and humiliation in the ring." <a href="http://o.canada.com/2012/08/17/electrifying-and-elusive-justin-trudeau-quietly-mulls-his-political-destiny/" target="_hplink">- Michael Den Tandt</a>

  • 8. Or Hamlet?

    "A leadership race without Justin Trudeau would be both Hamlet without the Prince of Denmark, and one more yawn before sleep." <a href="http://fullcomment.nationalpost.com/2012/06/16/rex-murphy-why-justin-trudeau-has-to-run-for-liberal-leader/" target="_hplink">- Rex Murphy</a>

  • 7. "Tantalizing"

    "Mr. Trudeau is tantalizing, but whether he is galvanizing is another question." <a href="http://www.theglobeandmail.com/commentary/justin-trudeau-is-the-best-hope-for-liberals-and-conservatives/article4249423/" target="_hplink">- Lawrence Martin</a>

  • 6. "He isn't an old fart"

    "He isn't an old fart. The Liberal party -- like the Conservatives -- has been run by, and for, old farts for too long. The party is in desperate need of a new generation of leadership. Trudeau, like Barack Obama in 2008, has the greatest ability to mobilize young people to work for him, and vote for him."<a href="http://www.torontosun.com/2012/06/16/justins-the-one-10-winning-reasons-why" target="_hplink"> - Warren Kinsella</a>

  • 5. "Expressive mane of hair"

    "You, with the expressive mane of hair and the explosive pronouncements that sometimes rival the idiocy of our other Justin, the Beeb." <a href="http://www.theglobeandmail.com/life/is-it-time-for-the-second-coming-of-trudeaumania/article4484207/?cmpid=rss1" target="_hplink">- Judith Timson</a>

  • 4. "His mane of black hair was tousled"

    "Under his suit jacket, the sleeve buttons on his dress shirt were undone. His necktie was knotted, but left loose over an open top button. His mane of black hair was tousled. Even in genteel disarray, even dressed more or less like a couple hundred of his parliamentary colleagues, the 40-year-old Liberal MP for the Montreal riding of Papineau looked like a million bucks." <a href="http://www2.macleans.ca/2012/05/04/justin-trudeau-should-be-the-next-leader-of-the-liberal-party-no-seriously/" target="_hplink">- Paul Wells</a>

  • 3. "He's got more charisma than the royal family and Lady Gaga combined"

    "He's got more charisma than the royal family and Lady Gaga combined. In Ottawa, which is Hollywood for ugly people, that matters. To win, political parties need some sizzle with their steak; Trudeau has sizzle in abundance. On the election hustings, when measured against Trudeau, Stephen Harper and Thomas Mulcair will look like Angry Old Guys, because, er, they are." <a href="http://www.torontosun.com/2012/06/16/justins-the-one-10-winning-reasons-why" target="_hplink">- Warren Kinsella</a>

  • 2. "Impossibly handsome"

    "The 41-year-old Liberal MP from the Montreal riding of Papineau, impossibly handsome, charming and much more comfortable in his skin than the bearer of such an iconic yet troublesome political name has any right to be..." <a href="http://www.theglobeandmail.com/life/is-it-time-for-the-second-coming-of-trudeaumania/article4484207/?cmpid=rss1" target="_hplink">- Judith Timson</a>

  • 1. "Lion-maned clothes horse with dimples like moon craters"

    "So the rail-thin, lion-maned clothes horse with dimples like moon craters, a giant-killing right hook and a weapons-grade surname will position himself as the loyal helpmate of a post-leadership-fixation Liberal Party? It's so crazy it just might work." <a href="http://www2.macleans.ca/2012/05/04/justin-trudeau-should-be-the-next-leader-of-the-liberal-party-no-seriously/" target="_hplink">- Paul Wells</a>