Updated

Editor's note: The following op-ed originally appeared in Commentary magazine.

Just when pundits were starting to agree that the odds are tipping in favor of the Republicans winning control of the Senate this November, reports of inquiries about potential misconduct by Louisiana Senator Mary Landrieu may make the embattled Red state Democrat’s re-election fight may be another nail in her party’s midterms coffin.

The story, published Friday night by the New Orleans Times-Picayune, reveals that in response to charges from her Republican challengers that she has been paying for campaign expenses, including flights, from official government funds rather than her private account, the senator has ordered an inquiry into the records of her office during the last 18 years she has been in the Senate. While the senator may hope this gesture may quiet her critics, the inquiry by her own legal counsel will not convince many people of her innocence even if it exonerates her. If anything, it draws more attention to allegations that could be both embarrassing and result in serious ethics charges.

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Unfortunately, for the senator, her lawyer won’t be the only one looking into her affairs. On Thursday, CNN reported that Landrieu had reimbursed the Senate the $5,700 charge for a charter flight home from Washington for a campaign appearance. Anyone who thinks that was the first such instance in which the Louisiana senator has played that trick is probably willing to buy a bridge across the Mississippi. If the Senate Ethics committee, or the Justice Department were to do some serious digging into her records, the results might require more than a mere reimbursement check.

Will this tip what was already looking like a dead heat between Landrieu and Republican Rep. Bill Cassidy into a likely GOP pickup? It’s hard to say.

Landrieu may be a Democrat in a state that votes Republican in presidential elections but she is a formidable politician. As I noted back in April, her strong constituent service and expertise in bringing home federal dollars to Louisiana has given her more than a fighting chance and even the neutrality, if not support, of some local Republican officials. Her family name is a popular brand in the state stemming from the ability of her father Moon, to manage to be that rare Louisiana Democrat who didn’t wind up in jail at some point during his career. Though there were plenty of questions raised about corruption involved in the building of New Orleans’ Superdome and other projects built while he was mayor, the former congressman, secretary of Housing and Urban Development and federal judge was never charged or convicted of anything. The same is true of Landrieu’s brother Mitch, the current mayor of the Big Easy.

But an even bigger edge for her is that the culture of politics in the state is such that ethical violations are rarely seen as fatal to the future of an officeholder the way they are in other, less easygoing places. To take just the most recent example, David Vitter, Landrieu’s Republican colleague in the Senate, survived his involvement in a prostitution scandal and may well succeed Bobby Jindal as governor of Louisiana in 2015. The list of Louisiana politicians who served jail time, let alone those who labored under ethical clouds, in the last century is too long to include in this piece. Suffice it to say that in the context of that state’s politics, looting the public treasury to pay for a campaign doesn’t exactly make Landrieu an outlier.

Nevertheless, the timing of the revelations isn’t going to help her just at a time when polls recently showed Cassidy to have finally caught and passed the incumbent, albeit by a statistically insignificant one percentage point margin.

Her difficulties are also significant because of all the endangered red state Democrats Landrieu seemed to be the one most likely to survive a tough challenge. If this race starts slipping away from her, then the chances of the Democrats holding the Senate will rest on Kay Hagen in North Carolina and Mark Pryor in Arkansas. Both are currently trailing their GOP opponents with the race to hold another Democratic seat in Iowa also starting to look like an uphill slog.

It won’t take much to tip any one of these elections from one party to the other. Which means that even in ethically challenged Louisiana, Landrieu’s using taxpayer dollars to fund her electioneering might just be the straw that breaks the camel’s back for a Democratic Party that needed its Senate candidates to run perfect campaigns to have a chance to keep control of one house of Congress this fall.