Whenever we see a deal being made we think about the quid pro quo - this for that. We want "transparency" - whatever that is. There is always something underneath.
Congressman Joe Sestak had been previously asked to run for Senator Specter's seat by the Senate mucky-mucks of the Democratic hierarchy. This is normal politics - see someone with potential and promote them. Congressman Sestak, an Admiral by trade, is used to this type of thing when he sees potential, he promotes it. He accepted the Democratic challenge.