Drawing a bright line between himself and his two likely opponents in the race for U.S. Senate, Marco Rubio on Monday attacked federal "card check" legislation.

“I oppose card check and any efforts like the Employee Free Choice Act to tip labor law in favor of unions through binding federal arbitration. I am concerned by labor unions’ unrelenting campaign for card check, which would eliminate workers’ right to a secret ballot in unionization elections," Rubio, the Republican nominee, told a gathering of the Associated Builders and Contractors in Fort Lauderdale.