Steve has a nice take on it, here.
And I see it's really being pushed and distorted, here on many issues. To take one...
A remarkable entry is the attempt to equate Harper's position on the Iraq war with Obama's. Where, for example, a 2005 Harper letter is cited as proof that Harper's position on Iraq would not have resulted in Canadian troops being sent. What's being cited is a Harper letter stating that at that time, in 2005, his position was that he "would not commit Canadian troops to that country." That would be an easy position to take in 2005. But this is not what Harper's decision would have been at all in 2003, as we know from his speech in 2003 in the House of Commons. He would have had Canada join the U.S. in Iraq from the start. Harper's been in lock-step with the Bush administration until, well, Obama was elected and he's now having to switch every position he holds.
It's really quite the thing today to see such superficial yet comprehensive efforts of the Conservatives to twin Harper with Obama. They're clearly worried about the Obama effect and its impact on Harper.