They don't go after someone as powerful as Stevens unless they have him.
"Justice Department indicts Sen. Ted Stevens. Prosecutors say he received $250K in gifts and services from VECO Corp."
I would guess that this is the tip of an Alaskan iceberg and there's more. I would also surmise that someone at VECO Corp. has flipped and struck a bargain with DOJ.
And I don't think the DOJ would have filed this at all unless they had an iron-clad case.
Arf (All men are innocent until proven guilty, Bow. No, they're guilty the minute they commit the crime. They aren't punished until proven guilty.)