POLL: Which MLS midyear pick up will have most impact?

Tim Cahill at first New York training session

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Midyear signings sometimes work out; sometimes they don't.

This season, there have been more big-time midyear acquisitions than normal, including several newly inked Designated Players and other DPs traded within the league.

Which one of the new or recently moved players will have the biggest impact on his new club's chances of reaching the playoffs and/or contending for the Cup?