Can Paul Martin count?

Okay, I'm confused, please read and then answer this question:

If you reduce the GST (as the Conservatives are putting forward) you save money for ALL Canadians. If you reduce income tax for the middle class, you save money for only the middle class, so roughly 60% of Canadians.

So someone please tell me if the above is true, how can Paul Marin possibly claim that the Liberal plan of reducing income tax for the middle class will affect more Canadians?

I'm perplexed. Its simple math here, its basic addition. I mean, we all know elections are times for politicians to throw things at a wall and hope something sticks, but seriously, you can't just say whatever you want and then pretend it makes sense, can you?