This appears to be the part they're saying is similar:
“Let us begin you and I together, one nation under God. United in our love for America. United in our love for each other,” Biden said. “For love is more powerful than hate, hope is more powerful than fear and light is more powerful than dark.” - Biden
"My friends, love is better than anger. Hope is better than fear. Optimism is better than despair. So let us be loving, hopeful and optimistic. And we’ll change the world." - Jack Layton
And some are trying to say that Layton's sentiment and quote was lifted from Canadian Prime Minister Wilfred Laurier, the reason people seemed to notice it from Layton was because he was apparently a very well liked politician in Canada.
“Let me tell you that for the solution of these problems you have a safe guide, an unfailing light if you remember that faith is better than doubt and love is better than hate,” - Laurier.