"Seem" is the key part of how the left (and NeverTrumpers) have been trying to paint him into a corner. Guilt by association is a long-used smear tactic and is being used here to distract from Hillary's real financial links to Russia. Remember the Panama Papers?
Those more implicate the Podestas, who do support HRC, but are not actually HRC. As I recall - and I'm open to correction - The Panama Papers did not reveal any direct connection between HRC or her close advisors and Russia.
But, the link between Manafort and Russia (in the Ukraine) is a solid, direct line.
ETA:
Apparently, John Podesta is part of the Clinton crew, but the lobbyist brother from the Panama Papers is not. Suspicious - sure. But not as direct a link as Manafort.
And really, is this something that we, as voters, should accept as a tie? "They both have ties to Russia" somehow validates Trump as a candidate?