Limbaugh Effect Gives Hillary Indiana?

As I reported here last week, Rush Limbaugh has instituted something called "Operation Chaos," wherein he urges Dittoheads (a pet name Limbaugh uses for his fans) to vote for Hillary Clinton in open Democratic Primaries in order to prolong the party's nominating process. Obama campaign spokesman Bill Burton sent this out last night via email:

According to the latest exit polling data, 17% of voters in the Indiana primary today said they would vote for John McCain in a Clinton/McCain matchup.

41% of that number is constituted by people who voted Clinton in the primary but also indicated they will vote for McCain in the general election.

That comes out to just under 7% of the primary electorate the number that may be attributed to a "Limbaugh Effect."

I checked it with a calculator and everything. On today's Obama campaign conference call, Senator John Kerry brought it up, too:

If it hadn't been for republicans taking democratic ballots, he likely would have won Indiana. Rush Limbaugh was tampering with the primary and the GOP has clearly delcared that they want Hillary Clinton as a candidate.

With only a 2 point margin in Indiana, it makes sense for the Obama campaign to point this out, but it begs the question of whether or not they are legitimizing Limbaugh's tactic. I contacted both campaigns for this story, but, as yet, have not received a response.