The first goal is $1M in 30 days, the second is $5M in 30 more days. In both cases the funds will be matched, so they already have $6M near hand, and realistically there isn't that much more you can do with $12M that you can't do with $6M.
I suspect May is to get the first little news articles in the press (Kickstarter meets Elections, underdog to use super pac against super pacs). The June goal is for the follow up articles that should get more widespread coverage.
I'm all for putting campaign finance reform at the front of 2014 and 2016. I'm in.
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Edit: Broken autofill on the donation page? Come on, make it easy. I had to type characters and access my memory to make this happen instead of just clicking.