The most potent illustration that Republicans have shifted their attitudes on immigration came Tuesday morning when all GOP members of the Senate Judiciary Committee rejected an amendment from Sen. Jeff Sessions, R-Ala., to severely limit the number of legal immigrants allowed into the country. The committee’s overwhelming ‘No’ vote shows that the battle for Republicans’ souls on immigration has shifted away from groups that want to reduce the influx of foreigners, like the Heritage Foundation, NumbersUSA, and Fairness for American Immigration Reform (FAIR), toward free-market groups that applaud increased immigration, such as Americans for Tax Reform and the CATO Institute....