OTTAWA — NDP Leader Thomas Mulcair was forced again Tuesday to revisit talks he had with the Conservatives in 2007 about coming on board as an adviser to the government on environmental issues.

 

He said he walked away from the offer because the government made it clear they weren't going to respect Canada's international environmental obligations, though he's also being accused of stepping away because the salary was too low.

 

But in contemporary Canadian politics, many politicians have seen their allegiances change — before his talks with the Tories, Mulcair was a Quebec Liberal. Here are some other prominent politicians who've switched their political colours over time for what they argued were philosophical reasons.