If Gonzales had resigned first and then Rove after him, it would have looked like they were both running away from the investigations (which is exactly what they are doing). But if Rove resigned first, then they could play it like the Rove resignation had nothing to do with the investigations and he chose to leave on his own terms.
The press shouldn't let them get away with this. The resignations have nothing to do with spending more time with the family; they have everything to do with Congressional subpoenas and the US attorneys investigation.
Most importantly, the Democrats shouldn't let them get away with this. They should continue the investigations to see where it leads anyway. If crimes have been committed by Rove and Gonzales (and people higher than them), they should be fully investigated whether some of these people are still in government or not.
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