In politics, one man’s mistake is another’s opportunity. Now that state Rep. Joe Driver, R-Garland, has been sentenced for “double dipping” — billing both his campaign and the state Legislature for the same expenses — opposition researchers in this primary season are scrambling for other examples.

But where there's smoke, it's often hard to prove there's fire, because of a lax state ethics code that allows lawmakers to use their campaign accounts for legislative expenses. The loophole, which lawmakers partially tightened last session, means there is little transparency about which pot of money lawmakers have used or ...

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