http://thecaucus.blogs.nytimes.com/2008/03/08/measuring-the-limbaugh-effect/On Wednesday’s show, after Mrs. Clinton won in Texas and Ohio, Mr. Limbaugh proclaimed victory. However, there is little to suggest that he successfully drove enough Republicans to vote strategically to impact the outcome.
“There’s just not a lot of evidence, when you start looking at the data, that there’s a lot of this sort of behavior in presidential primaries,” said Michael McDonald, an associate professor at George Mason University who studies voter turnout.
Mr. Obama actually won among Texas Republicans, who made up nearly twice as much of the voters in the Democratic primary as they did in 2004, at 9 percent, and 53 percent of them went for Mr. Obama, according to voter surveys by Edison/Mitofsky. In Ohio, where Republicans participated at similarly increased rates in the Democratic contest, Mrs. Clinton and Mr. Obama both received 49 percent of the G.O.P. vote.
Mrs. Clinton won the Ohio primary 54.3 percent to Mr. Obama’s 44 percent, and she took the Texas vote with 50.9 percent to 47.4 percent.
The Republican vote was “definitely not determinative of whether or not Clinton won those states,” said Professor McDonald. He added that the effect of Republican voters could have added “maybe a percentage point or two” to Mrs. Clinton’s total.