(Harrisburg) -- The eight Democrats running for Pennsylvania governor are aiming their campaign rhetoric at Governor Corbett, but that's not who they're running against.
The real task for each candidate is to convince Democratic voters that he or she would be the strongest nominee to challenge Corbett in the 2014 election.
Some noteworthy things are happening that will affect the Democratic campaign and ignite new debates as the May 20 primary approaches.
One was state Treasurer Rob McCord's long-awaited confirmation that he's running, making him the only statewide elected official in the race.
Also, labor unions that are a major source of campaign cash for Democrats are already taking sides. McCord, U.S. Rep. Allyson Schwartz and former state environmental protection secretary Katie McGinty have each received at least one union endorsement.
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