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U.S. Rep. Charles Boustany, a Republican from Lafayette, has told donors to his campaign committee that he's gunning for the Senate seat that will open up if Republican U.S. Sen. David Vitter wins election as governor this fall, the National Journal reports.

The report isn't exactly a surprise, as Boustany, now in his sixth term, has been considered a likely contender for the Senate if Vitter departs. But he's been more reticent than his House colleague, John Fleming, of Minden, who has openly declared he wants to succeed Vitter. Despite a shared party label and profession (both are doctors), there's a fair amount of difference between them.

Neither has made an official announcement, as the opportunity largely depends on the outcome of the governor's race. But Vitter is judged the front-runner in that campaign. If he wins, he could appoint his own successor, who could then run as an incumbent when Vitter's current six-year term expires in 2016. Other candidates also could jump in.

Click here to read the full National Journal report.